"Ranger Handbook: SH 21–76"(PDF). United States Army. February 2011. p. cover. Archived(PDF) from the original on 29 April 2011. Retrieved 24 April 2011.
"Ranger Handbook: SH 21–76"(PDF). United States Army. February 2011. p. cover. Archived(PDF) from the original on 29 April 2011. Retrieved 24 April 2011.