The UNSC Marine Corps was a branch of the United Nations Space Command responsible for expeditionary warfare and protection of UNSC vessels and orbital facilities. The Marine Corps functioned as the UNSC's primary method of terrestrial power projection, supporting a large and actively maintained amphibious capability facilitated by an extremely close relationship with the UNSC Navy. Using the mobility of the Navy, the Marine Corps was tasked with rapidly delivering combined-arms task forces, comprising armour, infantry and artillery and close air support. This role put the Marine Corps at the very forefront of any offensive warfare undertaken by the UNSC, frequently under the challenging conditions resulting from simultaneous orbital and ground fighting, and earned them a well deserved rep