Applied DNA Sciences Inc., a Stony Brook company that makes anti-counterfeiting products with strands of DNA, has secured a $3 million contract with the U.S. Department of Defense.

The two-year deal with the Defense Logistics Agency calls for Applied DNA to demonstrate how its technology could be used on bearings, piping, tubing and other components of military equipment.

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The contract is a key breakthrough for the company, which has struggled for a decade to turn a profit as it has developed anti-counterfeiting stamps using plant DNA that can be embedded on microchips, military equipment, cash, rare bottles of wine and other items.

Applied DNA has lost $1.9 million during the first six months of 2014. The company's stock rose 12.5 percent Thursday, to 12 cents.