[𝐔𝐧𝐢𝐭𝐞𝐝 𝐍𝐚𝐭𝐢𝐨𝐧𝐬 𝐒𝐩𝐚𝐜𝐞 𝐂𝐨𝐦𝐦𝐚𝐧𝐝 𝐌𝐚𝐫𝐢𝐧𝐞 𝐂𝐨𝐫𝐩𝐬] [𝐈𝐧𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧] The UNSC Marine Corps is a branch of the United Nations Space Command's Armed Forces responsible for conducting land-based expeditionary combat operations, using the mobility provided by the UNSC Navy to rapidly deliver forces. Marines are also charged with the defense of Navy vessels and installations from hostile forces. [𝐃𝐮𝐭𝐢𝐞𝐬] Expeditionary warfare. [𝐌𝐞𝐦𝐛𝐞𝐫𝐬𝐡𝐢𝐩] Enlistment.