The Defense Department said Thursday the contract represents full funding for the procurement of long-lead items the Air Force ordered along with 28 fiscal 2016 C-130J.
The covered aircraft are 14 C-130J, five HC-130J and eight MC-130J.
Lockheed Martin will carry out production work in Marietta, Georgia, through July 31, 2019.
The C-130J Super Hercules airlifter is built to aid humanitarian relief operations and perform aerial refueling and close air support.