The economy of plastic sold in bulk, popularity of army men, and competition with manufacturers led to army men being sold in large bags by Marx, Tim-Mee Toys and MPC for as little as a penny a piece in the mid-1960s. During this time, Marx gave the American army men actual enemy soldiers to fight such as German soldiers (molded in gray) in their 1962 "Army Combat" set and Japanese soldiers (molded in yellow) in their "Iwo Jima" set that was released in 1963. In 1965, a "D-Day" Marx set featured Allies such as French (horizon blue), British (khaki), and Russians. One of their last and largest playsets was the multi-level "Fortress Navarone" mountain set based on "The Guns of Navarone", which was available in the 1970s and pitted World War II Americans against Germans.