Vallejo Model Air Set: MERDC Camo ColorsVallejo Model Air Set: MERDC Camo Colors In the 1970s, the US Mobility Equipment Research & Design Command (MERDC) developed a system of camouflage patterns for US Army vehicles. Each camouflage pattern consists of 4 colors (two primary and two secondary colors); the conditions of the local terrain determined which of the patterns were to be used. Content: 8 x 18 ml 0. 6 fl oz Model Air 71. 057 Black 71. 137 US Light Green 71. 138 US Sand 71. 139 US