In the defense industry of the United States, a mobile offshore base (MOB) sometimes called a Joint Mobile Offshore Base (JMOB) — is a concept for supporting military operations where conventional land bases are not available. Such a floating offshore base has been researched and proposed, but never developed. A MOB is a modular floating base that can be deployed to provide flight, maintenance, supply and other forward logistics support operations. MOB modules will most likely be semi-submersibles which have significantly smaller wave-induced motions compared to conventional hulls.