In the US Army, Air Force and Marine Corps, a commissioned officer superior to a captain and inferior to a colonel. The equivalent rank in the US Navy is Lieutenant Commander[?]. The insignia for all four positions is a gold oak leaf.
... 34.6% from 25 to 44, 19.4% from 45 to 64, and 10.6% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 102.8 males. For every ...