In December 1941 based on the structure of the leather package, stationed in Hawaii at the Seventh United States Army Air Force fighter and bomber planes. The package can be found in the B-17D, B-18 Bolo (aka LI-2), P-40b and P-40C, P-36A, A-20 (aka A-20C) and C-33 (aka C-47) aircraft skins.