The sleeve rank insignia shown are those of the line officer corps. He served as a line officer in the Navy, in submarines. In 1993 he became a Forest Service line officer. She received a Navy commission in 1970 as a General Unrestricted Line Officer. A gifted mathematician, he taught at West Point and also served as a line officer. Navy officers serve either as a line officer or as a staff corps officer. During World War I, he served as a line officer aboard the cruiser . Dunagan was the only line officer with Alpha at the time. Fran McKee became the first female unrestricted line officer appointed to flag rank. Saul Tigh is a line officer assigned as executive officer on the Galactica. The gunnery officer was usually the line officer next in rank to the executive officer. The expression "line officer" is no longer current in the Royal Navy and Commonwealth affiliates.