List of numbered (rigid wall) shelters of the U.S. Army

The US Armed Forces use a lot of abbreviations to indicate the type of equipment fielded. The abbreviation S- is used for shelters, mostly rigid wall shelters (RWS), though in the past some other shelters (tents) got this designation. Rigid Wall Shelters are defined by the US army as: pre-sized structures (non-expandable and expandable shelters) that are transported by land, sea, or air. These shelters require minimal site preparation and no specialized set-up. Soft Wall Shelters are defined by the US army as: air supported and frame supported fabric structures that are transported and then erected or assembled on site Hybrid Shelters are defined by the US army as: a combination of rigid and soft wall shelters that are transported and erected or assembled on site (1), (2), (3). The army uses in addition extensions as A/G, B/G,C/G, /G and so on to indicate the kind of shelter.