Lt. Col. Seth E. Yost, former battalion commander, 1st battalion, 7th Marine Regiment, a native of Wellsboro, Pa., addresses the guests during the 1/7 change of command ceremony at Lance Cpl. Torrey L. Gray Field, Dec. 4, 2014. Yost thanked his family and battalion for making his service to the battalion a memorable one. (Official Marine Corps photo by Lance Cpl. Medina Ayala-Lo/Released) - Lt. Col. Seth E. Yost, former battalion commander, 1st battalion, 7th Marine Regiment, a native of Wellsboro, Pa., addresses the guests during the 1/7 change of command ceremony at Lance Cpl. Torrey L. Gray Field, Dec. 4, 2014. Yost thanked his family and battalion for making his service to the battalion a memorable one. (Official Marine Corps photo by Lance Cpl. Medina Ayala-Lo/Released)