C-17 is a Tau'ri military aircraft used on Earth.
History[]
In 2002, the Beta Gate which was aboard a C-17 from Peterson Air Force Base was to be transported on a Boeing 747. (SG1: "Redemption, Part 2")
In 2005, Teal'c of Chulak waited for a C-17 to take him to Peterson Air Force Base when he would accompany Prometheus in the search for the Trust's Al'kesh which was cloaked and in orbit around Earth. (SG1: "Full Alert")