Men's Air Force Flight Suit Cold Weather Jacket CWU-45/P 1LT Large

It is an official US Air Force Flight Suit Jacket. It is the green Nomex cold weather version.  Other branches of the US military might also officially wear this jacket as well.  Currently it has subdued Air Force 1st Lieutenant rank on the jacket.  It also has 4 velcro patches sewn on, that you would attach name tags and unit patches to.  It was only worn a few times during the 2004-2005 time frame.
The label states:
SIZE: LARGE
8415-00-310-1133
JACKET, FLYER'S, COLD WEATHER, 45/P
MIL-J-83388E
SP0111-00-0-4030
100% ARAMID
PROPPER INTERNATIONAL, INC.