The US Orbital Segment (USOS) is the name given to the components of the International Space Station

International Space Station

The International Space Station is a habitable, artificial satellite in low Earth orbit. The ISS follows the Salyut, Almaz, Cosmos, Skylab, and Mir space stations, as the 11th space station launched, not including the Genesis I and II prototypes...

 (ISS) constructed and operated by the US National Aeronautics and Space Administration

NASA

The National Aeronautics and Space Administration is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research...

 (NASA), European Space Agency

European Space Agency

The European Space Agency , established in 1975, is an intergovernmental organisation dedicated to the exploration of space, currently with 18 member states...

 (ESA), Canadian Space Agency (CSA) and Japan Aerospace Exploration Agency

Japan Aerospace Exploration Agency

The , or JAXA, is Japan's national aerospace agency. Through the merger of three previously independent organizations, JAXA was formed on October 1, 2003, as an Independent Administrative Institution administered by the Ministry of Education, Culture, Sports, Science and Technology and the...

 (JAXA).

The segment currently consists of eight pressurised modules (Unity (Node 1), Harmony (Node 2), Tranquility (Node 3), Destiny, Columbus

Columbus (ISS module)

Columbus is a science laboratory that is part of the International Space Station and is the largest single contribution to the ISS made by the European Space Agency ....

, Kibō

Japanese Experiment Module

The Japanese Experiment Module , also known with the nickname , is a Japanese science module for the International Space Station developed by JAXA. It is the largest single ISS module. The first two pieces of the module were launched on space shuttle missions STS-123 and STS-124...

, Quest, and Cupola), an Integrated Truss Structure

Integrated Truss Structure

the Integrated Truss Structure forms the backbone of the International Space Station, with mountings for unpressurized logistics carriers, radiators, solar arrays, and other equipment.-History:...

 and various other unpressurised elements, which together essentially comprise the base configuration of the cancelled US Space Station Freedom

Space Station Freedom

Space Station Freedom was a NASA project to construct a permanently manned Earth-orbiting space station in the 1980s. Although approved by then-president Ronald Reagan and announced in the 1984 State of the Union Address, Freedom was never constructed or completed as originally designed, and after...

. The segment is monitored and controlled from various mission control centres spread around the globe, including MCC-H, Col-CC

Columbus Control Center

The Columbus Control Centre is the Mission Control Center which is used to control the European Columbus research laboratory, which is part of the International Space Station . The control centre is located at the German Aerospace Center facility in Oberpfaffenhofen near Munich, Germany...

, ATV-CC, JEM-CC, HTV-CC and MSS-CC.