L-3 Communications Vertex Aerospace, L.L.C., Madison, Miss., is being awarded a $21,209,470 modification to a previously awarded an indefinite-delivery requirements contract (N00019-05-D-0023) for logistics services support of 119 TH-57B/TH-57C aircraft.  Services to be provided include repair and/or overhaul of aircraft, engines, avionics, and related components.  Funds will not be obligated at time of award.  Work will be performed at Naval Air Station Whiting Field, Milton, Fla., and is expected to be completed in September 2012.  Contract funds will not expire at the end of the current fiscal year.  The Naval Air Systems Command, Patuxent River, Md., is the contracting activity.