The Defense Department announced three contracts awarded to New Hampshire companies on Wednesday, totalling $106 million in new military-related work.

BAE Systems in Nashua was awarded a $42 million contract for infrared imaging detectors in support of the Army’s Quick Reaction Capability Program. The detectors are used to protect Army helicopters and fixed-wing aircraft and crews from infrared-guided missile attacks during low-altitude operations.

The company has until June, 2014, to complete the contract.

The bid was solicited through the Internet, and BAE was the only bidder.

L-3 Communications in Londonderry and Laser Devices Inc., of Monterey, Calif., will share a $41 million contract to provide aiming lights for rifles. Work location will be determined with each order, with an estimated completion date of Sept. 17, 2015.

The bid was solicited through the Internet, and the two companies were the only two submitting bids.

J.C.N. Construction of Manchester was awarded a $23 million contract for the construction and furnishing of an Armed Forces Reserve Center in Brunswick, Maine, with an estimated completion date of July 12, 2014.

There were eight bidders on the project.