摘要

United States Drill Team, sourcefile at: www4.army.mil/armyimages, Photo courtesy of US Army, ("Images on the Army Web site are cleared for release and are considered in the public domain. Request credit be given as "Photo Courtesy of U.S. Army" and credit to individual photographer whenever possible.")

许可协议

本文件是美国陆军军官或雇员，基于其个人公务目的拍摄或制作的作品。作为美国联邦政府的作品，本文件在美国属于公有领域。 العربية ∙ বাংলা ∙ català ∙ čeština ∙ Deutsch ∙ English ∙ español ∙ eesti ∙ فارسی ∙ suomi ∙ français ∙ hrvatski ∙ magyar ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ 한국어 ∙ lietuvių ∙ македонски ∙ മലയാളം ∙ မြန်မာဘာသာ ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ српски / srpski ∙ Türkçe ∙ українська ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−