privatisation. While launch vehicles were originally bought from privatecontractors, from the beginning of the Shuttle program until the Space Shuttle Challenger
(原始内容存档于2019-04-08). 维基共享资源上的相关多媒体资源:美国军事 Official U.S. Department of Defense website (页面存档备份,存于互联网档案馆) Global Security on U.S. Military Operations (页面存档备份,存于互联网档案馆)
International Herald Tribune. www.military.com. 4 January 2008 [22 April 2012]. Miller, T. Christian. Privatecontractors outnumber U.S. troops in Iraq.
Sautreuil, Pierre. Believe It or Not, Russia Dislikes Relying on MilitaryContractors. War Is Boring. 2016-03-09 [2017-09-18]. (原始内容存档于2020-11-22). Korotkov