President John F. Kennedy's first official act after his inauguration was to order the development of the Lockheed 300 on 13 March 1961, with a contract for five aircraft for test and evaluation to be designated the C-141.
约翰肯尼迪总统就职后的第一个官方行为是命令1961年3月13日开发洛克希德300，其中五架飞机的测试和评估合同被指定为C-141。