Navy speak for Individual Augment. Basically the Navy is sending individuals on TDY orders in theatre to 'augment' army units or other CENTCOM commands. As of 2 weeks ago, BUPERS told us there were 14,000 Navy personnel on the ground in the CENTCOM AOR. Typically IA's are given to those who are A)getting out B) need the IA for a 'check in the box' competitive reason or C) have time between PCS moves and it makes sense to send them while keeping them on track for career milestones.