Vietnam War Medal of Honor Recipient. He served in the Vietnam War in the United States Army as a First Lieutenant in Company A, 2nd Battalion, 35th Infantry, 25th Infantry Division. He was awarded the CMOH for his bravery in the Kontum Province, Republic of Vietnam, on March 12, 1967. His citation reads "For conspicuous gallantry and intrepidity in action at the risk of his life above and beyond the call of duty. While leading the 3d Platoon, Company A, on a flanking maneuver against a superior enemy force, 1st Lt. Karopczyc observed that his lead element was engaged with a small enemy unit along his route. Aware of the importance of quickly pushing through to the main enemy force in order to provide relief for a hard-pressed friendly platoon, he dashed through the intense enemy fire into the open and hurled colored smoke grenades to designate the foe for attack by helicopter gunships. He moved among his men to embolden their advance, and he guided their attack by marking enemy locations with bursts of fire from his own weapon. His forceful leadership quickened the advance, forced the enemy to retreat, and allowed his unit to close with the main hostile force. Continuing the deployment of his platoon, he constantly exposed himself as he ran from man to man to give encouragement and to direct their efforts. A shot from an enemy sniper struck him above the heart but he refused aid for this serious injury, plugging the bleeding wound with his finger until it could be properly dressed. As the enemy strength mounted, he ordered his men to organize a defensive position in and around some abandoned bunkers where he conducted a defense against the increasingly strong enemy attacks. After several hours, a North Vietnamese soldier hurled a hand grenade to within a few feet of 1st Lt. Karopczyc and 2 other wounded men. Although his position protected him, he leaped up to cover the deadly grenade with a steel helmet. It exploded to drive fragments into 1st Lt. Karopczyc's legs, but his action prevented further injury to the 2 wounded men. Severely weakened by his multiple wounds, he continued to direct the actions of his men until he succumbed 2 hours later. 1st Lt. Karopczyc's heroic leadership, unyielding perseverance, and selfless devotion to his men were directly responsible for the successful and spirited action of his platoon throughout the battle and are in keeping with the highest traditions of the U.S. Army". His Medal was posthumously awarded to his family by Secretary of the Army Stanley A. Resor on January 9, 1969.