Can the Pentagon prosecute military retirees under the UCMJ? Maybe — it depends. January 14 Retired Air Force lieutenant colonel Larry Rendall Brock Jr. was photographed on the Senate floor clad in tactical gear and holding flex cuffs. (Photo by Win McNamee/Getty Images) Recent reports of current service members, veterans and some military retirees participating in the insurrection at the U.S. Capitol on Jan. 6 have prompted calls for investigations into those connections and using the Uniform Code of Military Justice to prosecute the offenders. But the law is complicated — each of those groups falls into different categories when it comes to the UCMJ and military justice might not apply in many cases. The trickiest is retirees.