The follow-on order is worth $68.2 million and brings the total of orders under a 2007 indefinite-delivery/indefinite-quantity to more than $460 million.
The order of the infrared-detecting devices includes light-, medium- and heavy-weapon thermal sights from the DRS Thermal Weapon Sights II family of systems.
RSTA has manufactured and delivered more than 50,000 thermal weapon sights since 2004.
DRS thermal weapon sights employ 25-micron un-cooled vanadium oxide detectors, which enable troops to view the battlefield and pinpoint targets clearly through smoke, dust, haze, light fog and darkness.
"We are pleased that the Army has continued to call on DRS Technologies for thermal weapon sights to enable its soldiers to engage even more effectively in combat situations," said RSTA President Terry Murphy.
"As the largest producer of un-cooled focal plane arrays in the world, RSTA has set the pace for the development of military infrared technology applications."
DRS Technologies, which has headquarters in Parsippany, N.J., is a leading supplier of integrated products, services and support to military forces, intelligence agencies and prime contractors worldwide. The company is a wholly owned subsidiary of Finmeccanica SpA.