AMSEC, L.L.C., Virginia Beach, Va. (N65540-11-D-0022); Delphinus Engineering, Eddystone, Pa. (N65540-11-D-0020); General Dynamics Information Technology, Fairfax, Va. (N65540-11-D-0019); and NDI Engineering, Thorofare, N.J. (N65540-11-D-0021), are each being awarded indefinite-delivery/indefinite quantity, cost-plus-fixed-fee, multiple award contracts in the amount of $91,474,687 for services to support hull, mechanical, and electrical machinery and systems on Navy vessels, other federal agency vessels, federally contracted vessels and platforms, selected maritime agency vessels, and select land based sites. This contract will include prototype engineering; design, development, build, and testing; technology insertion; performance specifications; performance and data analysis; system fault tree analysis; system safety analysis; system integration; installation support; computer programming and software engineering; software verification and validation; integrated logistics support document preparation and system training development; and on-site technical support, alteration services, integrated logistics, and staging. The work is to be performed in Norfolk, Va. (45 percent), San Diego, Calif. (40 percent), and Mayport, Fla. (15 percent), and is expected to complete in September 2016. Contract funds in the amount of $880,363 will expire at the end of the current fiscal year. This contract was competitively procured through the Navy Electronic Commerce Online and Federal Business Opportunities websites, with four offers received. The Naval Surface Warfare Center, Carderock Division, Ship System Engineering Station, Philadelphia, Pa., is the contracting activity.