The 1st Topographic Platoon is a military unit located on Camp Pendleton, California. It is composed of members of the Geographic Intelligence Specialist Military Occupational Specialty (MOS) 0261. Most members of the 0261 field are highly trained intelligence operators with extensive knowledge of geospatial intelligence, terrain analysis, land navigation techniques, datums and ellipsoids, coordinate systems, and cartography that make them a valuable asset to the Marine Expeditionary Force. All members are required to attend a 7-month course at the National Geospatial-Intelligence College on Fort Belvoir, Virginia.