Lockheed Martin Corp. (NYSE:LMT) is being awarded a $4 billion U.S. Navy Contract for 30 F-35 Strike Fighter aircraft. This is the fifth batch of low-rate initial production according to the Defense Department.

This deal would give 21 conventional models for the Air Force, six carrier variants for the Navy and three short-takeoff and vertical landing versions for the Marine Corps.

Company spokesman, Michael Rein, has said detalis of the deal have not been worked and referred to the government’s announcement as an “undefinitized contract action” subject to further negotiation.

“This is welcome news for both Lockheed Martin and our many F-35 suppliers and will help ensure we continue to meet production schedules outlined by the program,” he added.

The Pentagon plans to buy more than 2,440 F-35 aircraft in three different models for the various branches of the military. This will be the most expensive Pentagon purchase in history and is projected to cost $382.5 billion through 2035. The F-35 is being developed with eight foreign countries to replace at least 13 types of aircraft.

Shares of Lockheed Martin Corporation (NYSE:LMT) closed up 1.18% on Friday at $77.49. LMT traded 12 million shares on Friday and trades 2.7 million shares a day on average.