L-3 Communications Vertex Aerospace LLC, Madison, Mississippi, is being awarded a $79,895,466 modification to a previously awarded indefinite-delivery requirements contract (N00019-13-D-0007) to exercise an option for the organizational and depot level logistics services required to support and maintain the TH-57 fleet.  Work will be performed at the Naval Air Station (NAS) Whiting Field, Milton, Florida (98 percent); and NAS Patuxent River, Patuxent River, Maryland, and is expected to be completed in May 2017.  No funds are being obligated at time of award; funds will be obligated against individual delivery orders as they are issued.  The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.