L-3 Communications Vertex Aerospace LLC, Madison, Mississippi, is awarded a $42,349,412 modification (P00028) 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 Whiting Field, Milton, Florida, and is expected to be completed in November 2018.  No funds are being obligated at time of award; funds will be obligated against individual delivery orders as they are issued.  The Naval Air Warfare Center Training Systems Division, Orlando, Florida is the contracting activity.