There is no fixed clock on an Article 120 investigation. No provision of the Uniform Code of Military Justice sets a deadline by which a military criminal investigative organization must finish looking into a sexual assault allegation. As a practical matter, investigations into rape, sexual assault, aggravated sexual contact, or abusive sexual contact commonly run for several months, and complex cases can stretch well past a year. For an accused, the uncertainty of that timeline is often as difficult as the allegation itself.
A typical range, not a guarantee
Most Article 120 investigations conducted by the Army Criminal Investigation Division, the Naval Criminal Investigative Service, the Air Force Office of Special Investigations, or the Coast Guard Investigative Service take somewhere in the range of several months to complete. Cases that turn primarily on witness statements and a straightforward set of facts tend to resolve faster. Cases that involve digital forensics, multiple witnesses, or events spread across more than one location frequently take much longer, sometimes extending past a year and a half when laboratory and forensic backlogs come into play.
It is important to treat any range as a general expectation rather than a rule. Every case is different, and an investigation can close quickly or remain open far longer than average depending on the specific facts.
What drives the length of an investigation
Several recurring factors explain why these investigations vary so widely in duration.
Digital forensics is one of the largest. When investigators seize phones, computers, or other devices, the data often goes to a forensic laboratory that handles cases from many units. Backlogs at those laboratories can add weeks or months before results come back.
The number and availability of witnesses also matters. Service members transfer, deploy, and separate. Coordinating interviews across time zones and duty stations slows the process. Medical and forensic examination records take time to gather and analyze.
The complexity of the underlying events plays a role as well. An allegation involving a single encounter is simpler to investigate than one spanning multiple incidents, locations, or alleged victims.
Finally, the path the case takes through the prosecution structure affects perceived timing. Since the Office of Special Trial Counsel assumed authority over covered offenses including Article 120, the investigative findings are routed to independent special trial counsel who evaluate the evidence and decide on charges. That review is part of the overall life of a case even though it follows the investigative phase.
The investigation is only one phase
The investigation is the first major stage, but it is not the whole timeline. After investigators close their work and forward the report, the case may proceed to a preliminary hearing under Article 32, then to a referral decision, then to motions and trial preparation, and finally to the court-martial itself. Each of these stages adds time. From the first allegation to a final resolution, an Article 120 case can take well over a year, and sometimes considerably longer.
Why the open period feels long for the accused
During an investigation, an accused may be subject to a no-contact order, a flag or hold on favorable personnel actions, and restrictions on duties or movement, even though no charges have been filed and the person is presumed innocent. Because there is no statutory deadline, the accused often cannot predict when the uncertainty will end. This is one reason defense counsel encourage involvement early, so that the defense can begin preserving evidence and identifying witnesses while memories are fresh rather than waiting for the investigation to conclude.
The bottom line
Article 120 investigations typically last several months, with complex cases reaching a year or more, and there is no statutory limit that forces them to close by a set date. The timeline is driven by forensic backlogs, witness availability, the complexity of the allegation, and the independent charging review that now applies to these offenses. Anyone under investigation should expect a long and uncertain process and should treat the early weeks, not the eventual trial date, as the time to secure experienced legal help.
Disclaimer
This article is provided strictly for general educational and informational purposes. It is intended to explain how the Uniform Code of Military Justice (UCMJ), the Rules for Courts-Martial, the Military Rules of Evidence, and related military administrative processes work as a matter of public legal education. It does not constitute legal advice, a legal opinion, or a recommendation about any particular case, and it is not a substitute for advice from a qualified military defense attorney who can evaluate the specific facts and command, service, and jurisdictional circumstances involved.
Reading this article, or contacting any website on which it appears, does not create an attorney-client relationship between the reader and any law firm, attorney, or author. Every court-martial, nonjudicial punishment action, administrative separation, and security-clearance matter turns on its own facts, the charged articles, the convening authority, the service branch, and the evidence, and outcomes vary widely from one case to another.
Military law also changes over time. The Military Justice Act of 2016 (effective January 1, 2019) and subsequent National Defense Authorization Acts renumbered and rewrote many punitive articles, revised the Article 32 preliminary hearing, and altered sentencing, clemency, and appellate procedures. Statutes, regulations, executive orders, the Manual for Courts-Martial, and decisions of the service Courts of Criminal Appeals and the Court of Appeals for the Armed Forces may have been amended, superseded, or reinterpreted after this article was written, and article numbers or procedures cited here may have changed.
For these reasons, no reader should act or decline to act based on this content without first consulting a licensed attorney experienced in military justice about their own situation. The author and publisher make no warranty, express or implied, as to the accuracy, completeness, timeliness, or current applicability of the information provided, and disclaim any liability for any action taken or not taken in reliance on it. If you are facing investigation, charges, or an adverse administrative action, time limits may apply, and you should seek qualified counsel promptly.