The companies will provide the non-recurring engineering, logistical support, aero model and software modifications required to update the interim defensive weapon system.
Contract funds will not expire at the end of this fiscal year.
The companies will perform 95 percent of the work in Johnson City, N.Y. and the rest in Philadelphia.
The Pentagon expects work under the cost-plus-fixed-fee contract to finish in December 2015.
The Naval Air Systems Command in Patuxent River, Md. is the contracting activity.