The President of the United States of America takes pleasure in presenting the Navy Cross to Captain (MC) Harry Heasley Dinsmore, Sr. (NSN: 0-513578), United States Navy, for extraordinary heroism on 1 October 1966 while serving as Chief of Surgery at U. S. Naval Support Activity, DaNang, Republic of Vietnam. With full knowledge of the serious hazards involved and with complete disregard for his own personal safety, Captain Dinsmore volunteered to perform a surgical operation to remove a live 60-mm. mortar shell from the chest wall of Private First Class Nguyen Luong, Army of the Republic of Vietnam. The impact fuse of the mortar shell was partially activated and could easily have detonated at any time during the operation, resulting in certain death to Captain Dinsmore and his patient. Exhibiting outstanding professional skill and calmness, Captain Dinsmore took command of the situation and successfully removed the shell. By his heroic conduct and fearless devotion to duty, Captain Dinsmore saved the life of the patient and upheld the highest traditions of the United States Naval Service.