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LTC (Ret) Sean F. Mangan

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Experienced Military Lawyer & Former Judge handling UCMJ & Admin Military Cases
  • Military Law
  • Oregon, UCMJ / Military Justice System, Washington
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Client Reviews
Matthew T. July 24, 2023
Absolutely fantastic! I am an active duty E-6 Technical Sergeant in the Air Force, stationed in Shaw AFB, SC. I cannot say enough how impressed I am with Mr Mangan. I was facing an Article 120 with multiple specs and an article 128. He reviewed the facts, the evidence, and the testimonies of everyone involved. He kept in mind that I was going through a divorce and custody battle, as well. He was extremely knowledgeable on the law and was able to strategically examine and cross examine witnesses so that we got what we needed and more from them. Something that was extremely important to me is that Mr Mangan made it very obvious that he cared about me as a person, not just another client. He kept me up to date, was understanding and inquired about my other struggles, and he listened to what I had to say and took it into consideration as needed. Mr Mangan did what every good attorney should do and he realized that I knew this case backwards and forward, so he was sure to take what I said and use it if he found it necessary. Mr Mangan no doubt saved my 12 year active duty Air Force career and I cannot thank, praise, or recommend him enough for it. There is a joke that 99% of lawyers give the rest a bad name- well he is without a doubt part of that 1%!
Ian G. May 10, 2023
Excellent legal representation Sean Mangan is an excellent lawyer and I am honestly very grateful to have him representing me. I would find it hard to believe there is a lawyer who could compare to him on both the military and civilian side of things, he is very wise and he is excellent at defusing a situation and getting around to peoples better side. Personally I felt like he was very invested in my case and he actually cares about how the case affects you and your family. He is very thorough and dedicates the appropriate amount of time to you and your situation. Honestly I can’t put into words how great he is but being represented by him is literally a privilege. Thank you Sean Mangan.
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Expert in UCMJ and military legal matters, routinely representing Soldiers, Sailors, Marines, Airmen, and Coast Guardsmen in Military Criminal Investigations and Command Investigations. Experienced in Sexual Assault, Sexual Harassment, Domestic Violence, Internet Offenses, Toxic Leadership, Hot Urinalysis Results, Article 120, DHA Clinical Adverse Actions, and other military offenses. Proven results in Courts-Martial, Administrative Separation boards, and Military Medical Privileging cases. Successfully handled letters of reprimand, bars to reenlistment, negative evaluation reports, and other admin matters.

For 30 years I've worked criminal cases, on the streets and in the courtroom, civilian and military, and at local, state, and federal levels. I've been a law enforcement officer, Soldier, prosecutor, defense counsel, magistrate, appellate counsel, law professor, and judge. I've been certified by the Army at the highest level of military legal proficiency as a "Master Military Justice Practitioner" (ASI-3T). As a retired Army JAG Lieutenant Colonel, with prior operational and law enforcement experience, I bring my full range of skills, knowledge, and abilities to serve you.

Practice Area
Military Law
Additional Practice Area
  • Military Justice and Adverse Actions (all services)
Video Conferencing
  • FaceTime
  • Zoom
  • Microsoft Teams
  • Free Consultation
    Free confidential legal consultation available, to be scheduled upon request.
  • Credit Cards Accepted
  • Rates, Retainers and Additional Information
    Primarily flat fees to give clients clarity and control. Only current action/phase is billed. Billing through Clio Payments: electronic invoice & secure link sent directly to client.
Jurisdictions Admitted to Practice
Oregon State Bar
ID Number: (Currently Inactive Member)
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UCMJ / Military Justice System
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Washington State Bar Association
ID Number: 55286
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Air Force Court of Criminal Appeals
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Army Court of Criminal Appeals
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Court of Appeals for the Armed Forces
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U.S. Supreme Court
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  • English
Professional Experience
Legal Counsel
- Current
Private Legal Counsel, available to represent military personnel and their families. 100+ clients served to date
Criminal Law Policy Attorney
US Army
Senior Policy Attorney for Criminal Law Division, Office of the Judge Advocate General, Headquarters, U.S. Army. Involved in edits of Manual for Courts-Martial and the rewrite of Army criminal law regulation (AR 27-10). Advised on issues of criminal law and corrective-action policies for senior Army leadership.
Trial Judge
US Army
Military Judge, U.S. Army Trial Judiciary. Handled the full range of offenses, legal issues, and hearings in military justice trials, including presiding as judge-alone court and sentencing authority.
Regional Defense Counsel
US Army
Senior and supervising defense counsel for Southwest Continental United States (SW-CONUS). Led and managed 30 defense counsel (and their support staffs) responsible for all military justice matters in SW-CONUS, approximately 25% of all Army courts-martial trials.
Professor of Criminal Law
Faculty at the DOD's only ABA-Accredited / LLM-granting law school: The Judge Advocate General's Legal Center and School (TJAGLCS). Taught the full range of topics in criminal law and procedure to a variety of resident and non-resident courses, with students ranging from newly-commissioned military attorneys to military judges.
Special Operations Legal Counsel (Deployed)
DOD/Joint Task Force
Led a Joint/Multinational Team of Intel Agents, Law Enforcement Agents, Attorneys, Paralegals, and Iraqi Legal Personnel in direct support to Tier-1 US SOF Task Force, warranting and prosecuting high-value terrorism suspects in foreign courts.
LLM Candidate
US Army
LLM in Military Law, with Special Certificate in Criminal Law and Military Justice
Supervising Appellate Counsel
US Army
Supervised a Branch of 8 Appellate Attorneys in the Defense Appellate Division, US Army Legal Legal Services Agency
Appellate Counsel
US Army
Appellate Defense Counsel, US Army Legal Services Agency. Appealed court-martial convictions and legal issues to the Army Court of Criminal Appeals, Court of Appeals for the Armed Forces, and Supreme Court of the United States.
Special Assistant United States Attorney
Chief of Military Justice
US Army
Senior and Supervising Prosecutor for JRTC & Fort Polk, LA. 50 courts-martial and 300+ adverse legal actions per year.
Military Magistrate
US Army
Part-time military magistrate: issued warrants, reviewed and approved pretrial confinement
Chief of Administrative Law
US Army
Senior and Supervising Counsel for all admin/civil legal issues on JRTC & Fort Polk: ethics, employment, environmental, contract, admin investigations, etc.
Administrative Law Attorney
US Army
Handled the full range of government administrative law issues
Intern Prosecutor
Lane County Prosecutor's Office
Solo-tried multiple criminal cases, assisted on major felony cases
Intern Prosecutor
US Army
While in law school, assisted during summer months at the Fort Lewis (JBLM) Military Justice Shop, prepping cases and leveraging my law enforcement experience to aid in criminal prosecutions.
US Army Military Police
Commissioned Officer of US Army MP Corps. Served in both law enforcement and tactical roles, in both action and leadership positions. Later served in support of Army Prosecutor offices in case-support role, prior to becoming a licensed attorney and Army Judge Advocate.
Army Command & General Staff College
ILE-CC (2011) | Leadership
Intermediate Leadership - Core Curriculum (Fort Lee Campus)
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LL.M. (2009) | Military Law, Criminal Law Cert.
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University of Oregon School of Law
J.D. (2003) | Law, Criminal Law Specialty Cert.
Honors: Superior Advocate, Mock Trial
University of Oregon School of Law Logo
Gonzaga University
B.A. (1996) | Sociology & Philosophy
Honors: Cum Laude
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Bronze Star Medal
Superior Trial Advocate Award
University of Oregon School of Law
Professional Associations
Washington Defenders Association
- Current
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International Association of Military Criminal Defense Lawyers
- Current
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Washington State Bar Association
- Current
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Oregon State Bar
- Current
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American Bar Association
- Current
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Articles & Publications
Army Regulation 27-10 (2019 Revision Team)
US Army
DD Form 453 - Military Subpoena Form
Department of Defense
Crimes and Defenses Deskbook
Speaking Engagements
Military Justice Overview & Update, Seattle, Wa
Washington Bar Association - Military Law Section (LAMP)
Master Military Justice Practitioner (ASI 3T)
U.S. Army
UCMJ Article 27B
DOD - Practice in Courts-Martial for all Services of the US Armed Forces
Websites & Blogs
Mangan Law - Main Page
Legal Answers
4 Questions Answered
Q. How far from base can you live? My ex is stationed at JBLM WA and "moved" to Michigan.
A: Several things govern where a service member may reside. Local policies will dictate how far from the installation an individual can be. These "local pass" rules effectively set a distance limit that service members must stay within and must seek approval (a "mileage pass") if they exceed it. Additionally, service members may have provisions in their current assignment orders dictating where a service member may live while assigned to a particular unit. This is important because it implicates the Basic Allowance for Housing (BAH) that the service member is entitled to. It is important to remember that every assignment is different. There are many times that a service member is assigned to a unit at one installation but is authorized to perform duty somewhere else. For example, when I was a military judge I was assigned for to a Washington DC-area organization (the Army Trial Judiciary) located at Fort Belvoir, but my orders authorized my place of duty and residence in the JBLM area. Without knowing all the details of your ex-husband's assignment and orders (and possible authorized modifications) is is impossible to answer your question with certainty. ... Read More
Q. I been married for 19yrs and have been a Military stay at home mom and my husband is decided he doesn’t want me anymore
A: You are absolutely entitled to more than just child support. Your military spouse is likely going to receive a military pension, which is a considered to visible property, and you will be entitled to a portion of that property in the divorce process as you would any other piece of property such as a house or investment fund. I highly recommend that you retain an attorney who specializes in military benefits for the resolution of your divorce case. In the meantime, I would recommend that you contact his chain of command, and request that he be ordered to provide interim support to you during the ongoing divorce process and separation.
Q. If I am a former prisoner at a military correctional facility am I allowed to contact other former inmates?
A: It depends on the conditions of your release. For service members who served a longer sentence (those over 10 years and usually those over 20) there is the possibility of early release through a parole system. When released, those individuals may carry similar conditions on release that limit who they have contact with. If you served your sentence fully and was released, then normally there is no prohibition on who you contact with. (However, there may be other orders/authorities from the military or other jurisdictions, depending on your case, that could impact you.)
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Contact & Map
Mangan Law
The Law Offices of Sean F. Mangan, PLLC
Main Office and Firm HQ
10661 Old Frontier Road NW, Suite 211
Silverdale, WA 98383
Telephone: (360) 908-2203
Monday: Open 24 hours
Tuesday: Open 24 hours
Wednesday: Open 24 hours
Thursday: Open 24 hours
Friday: Open 24 hours (Today)
Saturday: Open 24 hours
Sunday: Open 24 hours
Notice: By appointment only. This map reflects actual locations where we have represented clients. Our firm understands the duty hours that affect our military and first responder clients. We can arrange to meet or speak with you at any time.
Joint Base Lewis-McChord
2109 Pendleton Ave
JBLM, WA 98433
Notice: I meet my JBLM military clients at this location. By appointment only. JBLM is our busiest installation, over 100 clients served.
Joint Base Elmendorf-Richardson
600 Richardson Drive, B346
JBER, AK 99505
Notice: I meet my JBER military clients at this location. By appointment only. JBER is among our busiest installations for UCMJ and military admin cases. Dozens of satisfied JBER clients, including uniformed personnel and and DOD civilians!
Naval Base Kitsap (Bangor, Bremerton, Keyport)
Naval Base Kitsap, WA, USA
Notice: Services provided to this location
Fort Wainwright
Fort Wainwright, AK, USA
Notice: We routinely handle matters at this military installation.
Naval Air Station Whidbey Island
Naval Air Station Whidbey Island, WA, USA
Notice: We routinely handle matters at this military installation.
Fairchild Air Force Base
Fairchild AFB, WA, USA
Notice: We routinely handle matters at this military installation.
Mountain Home Air Force Base
Mountain Home AFB, ID, USA
Notice: We routinely handle matters at this military installation.
Eielson Air Force Base
Eielson AFB, AK, USA
Notice: We routinely handle matters at this military installation.
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