For gallantry in action while engaged in military operations involving conflict with an armed hostile force in the Republic of Vietnam. Staff Sergeant DeHart distinguished himself by exceptionally valorous action on 14 May 1969 while serving as a platoon leader with Company B, 2nd Battalion (Airmobile), 5th Cavalry during a reconnaissance mission in Tay Ninh Province, Republic of Vietnam. When his unit became engaged with a large enemy force, Staff Sergeant DeHart immediately moved to a forward position in order to direct the fire of his men. When it became necessary to withdraw, Staff Sergeant DeHart remained in the forward position. While completely exposed to the hostile fire, he covered his men as they withdrew. Early the next morning Staff Sergeant DeHart led his men into the contact area again and because of Staff Sergeant DeHart's courageous effort on the previous evening, little resistance was given. Staff Sergeant DeHart's gallant action is in keeping with the highest traditions of the military service and reflects great credit upon himself, his unit and the United States Army.