Charles Rex Arbogast / AP The general in charge of an Army Reserve unit based in Darien has lost her command, and multiple soldiers have been reprimanded as the result of an investigation into allegations that sexual assault complaints were mishandled for years. The investigation stemmed from a complaint by Amy Braley Franck, a civilian sexual assault victim advocate with the Army Reserve’s 416th Theater Engineer Command, which provides technical and engineering support for U.S. military forces and serves as the headquarters for nearly 11,000 soldiers in 26 states west of the Mississippi River. Braley Franck, who lives in Oswego, accused the unit’s commanders of improperly opening internal investigations of two sexual assault complaints rather than referring them for criminal investigations.