Trump's partisan comments received cheers or jeers from the crowd, an expression of political views in uniform that would typically result in a reprimand.
The Friday night discussion on veterans issues is part of a series of events from Democrats scheduled around the controversial Army parade in Washington.
Decades after Staff Sgt. William Owens' heroic actions at La Fiere Bridge, his Bronze Star was posthumously upgraded thanks to the efforts of a veteran.
Veterans visited congressional offices this week to deliver messages of concern over recent Pentagon moves targeting the roles of women in the military.