The Lockheed Martin Corp. (NYSE: LMT) was awarded a contract worth $489.53 million to begin purchasing parts, materials, and components for a seventh batch of 35 F-35 Joint Strike Fighter planes, the U.S. Defense Department announced Friday.

In this batch of F-35 fighters will be 19 conventional takeoff and landing, or CTOL, aircraft for the U.S. Air Force; three CTOLs for the government of Italy; 2 CTOLs for the government of Turkey; six short takeoff vertical landing, or STOVL, aircraft for the U.S. Marine Corps; one STOVL for the government of the U.K.; and four carrier-variant aircraft for the U.S. Navy.

Four-fifths of the work will be carried out in the U.S.: Fort Worth, Texas (35 percent); El Segundo, Calif. (25 percent); Orlando, Fla. (10 percent); Nashua, N.H. (5 percent); and Baltimore (5 percent). One-fifth of the work will be carried out in the U.K.: Warton, England (20 percent).

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The Pentagon anticipates the work will be completed next June.

The Defense Department's announcement of the new contract arrived as Lockheed Martin continued to hire temporary workers to maintain F-35 production at its Fort Worth plant, where 3,300 members of the International Association of Machinists and Aerospace Workers have been on strike since April 23 over health-care and pension-benefit issues, as reported by the New York Times.

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Based in Bethesda, Md., Lockheed Martin is the Pentagon's largest supplier.