Some, intended for specific trade routes, were built with significant modifications in length and capacity.[1][2] In 1937, MARCOM distributed tentative designs for criticism by shipbuilders, ship owners, and naval architects.Building costs were to be minimized by standardization of design and equipment, and the ships were to have sufficient speed and stability that they could be used as naval auxiliaries in time of national emergency.Many of the ships such as SS Donald McKay were converted by the U.S. Navy for service during World War II.According to the War Production Board, in 1943 the C-2 had a relative cost of $313 per deadweight ton (10,800 deadweight tonnage)[4] for $3,380,400; which at $14 to $1 inflation of 1945 to 2020 amounts to $48,136,896[citation needed] Federal SB, NJ Moore DD, CA Consolidated, CA Western Pipe&Steel, CA Federal SB Sun Yards, PA Newport News, VA Tampa SB