A member of the New York National Guard who was assigned overseas with the 10th Mountain Division has died in Afghanistan. The Department of Defense says 24 year old 1st Lt. Joseph Theinert died on Friday as a result of a rocket propelled grenade attack. Theinert was assigned with the army's 1st Squadron, 71st Calvary Regiment, 1st Brigade Combat Team and reported to Ft. Drum in July of last year. The Sag Harbor, NY native is survived by his parents and a brother.