The Air Command and Staff College (ACSC) is a 10-month master's-level resident program that prepares field grade USAF, U.S. Army and USMC officers in pay grade O-4 and USN / USCG officers in pay grade O-4, their international counterparts, and U.S. civilian equivalents, for positions of higher responsibility within the military and other government agencies. Often referred to as "intermediate level education" (ILE), intermediate level professional military education (intermediate level PME) or phase I joint PME, ACSC is also available via "distance learning", primarily a CD-ROM enabled correspondence course.