（之后）堑壕只作为攻城战战术的一部分而存留下来，直到小口径火器以及加农炮的火力得到提升，迫使敌我双方在美国内战（1861-1865年）中再次利用壕沟作战。
Trenches remained merely a part of siegecraft until the increasing firepower of small arms and cannon compelled both sides to make use of trenches in the American Civil War (1861–65).
现在已经安装在美国陆军和海军陆战队的40多种平台上，其中包括轮式和履带式车辆、战术作战中心和其他指挥部。
They are installed on more than 40 Army and Marine Corps vehicle types, including wheeled and tracked vehicles, in Tactical Operations Centers and other command posts.
该直升机的制造商西科斯基尚未承认这架直升机是否是他们的，而美国陆军特种作战司令部同样未予确认。
The helicopter's producer, Sikorsky, hasn't acknowledged that the helicopter is one of theirs, and the U.S. Army's Special Operations Command hasn't confirmed it either (and won't).
位于科罗拉多州施里弗空军基地的美国空军空间司令部第二空间作战中队(2sops)负责GPS星座军用和民用的管理和运行。
Air Force Space Command's 2nd Space Operations Squadron (2sops), based at Schriever Air Force base, Colo., manages and operates the GPS constellation for both civil and military users.
美国特种作战司令部（USSOCOM）为其针对小型无人机系统（UAS）需求的全环境使能变型（AECV）计划选中AeroVironment公司的PumaAE装置。
The U.S. Special Operations Command (USSOCOM) has selected AeroVironment Inc.'s Puma AE as its All Environment Capable Variant (AECV) solution to the Small Unmanned Aircraft System (UAS) requirement.
美国海军海上系统司令部的海上水面作战中心Dahlgren分部为主要合同授权机构(合同号n 00 178-08 -D - 5394)。
The Naval Sea Systems Command, Naval Surface Warfare Center, Dahlgren Division, Dahlgren, Va. is the contracting authority (contract Number N00178-08-D-5394).
该直升机的制造商西科斯基尚未承认这架直升机是否是他们的，而美国陆军特种作战司令部同样未予确认。
The helicopter's producer, Sikorsky, hasn't acknowledged that the helicopter is one of theirs, and the U. S. Army's Special Operations Command hasn't confirmed it either (and won't).
该直升机的制造商西科斯基尚未承认这架直升机是否是他们的，而美国陆军特种作战司令部同样未予确认。
The helicopter's producer, Sikorsky, hasn't acknowledged that the helicopter is one of theirs, and the U. S. Army's Special Operations Command hasn't confirmed it either (and won't).
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