L-3 Communications Vertex Aerospace, Madison, Mississippi, is awarded a $23,467,814 modification (P00021) to a previously awarded, firm-fixed-price, indefinite-delivery requirements contract. This modification extends services and adds hours for continued depot level maintenance, logistics, and sustaining engineering services in support of the C-12 Navy aircraft and the C-12 Marine Corps Reserve aircraft. Work will be performed in Belle Chasse, Louisiana (13.79%); Okinawa, Japan (13.79%); Bahrain (10.34%); Atsugi, Japan (10.34%); Guantanamo Bay, Cuba (10.34%); Iwakuni, Japan (6.9%); New River, North Carolina (6.9%); Beaufort, South Carolina (6.9%); Yuma, Arizona (6.9%); Patuxent River, Maryland (6.9%); Camp Pendleton, California (3.45%); and Misawa, Japan (3.45%), and is expected to be completed in January 2023. No funds will be obligated at the time of award; funds will be obligated on individual orders as they are issued. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.