The Air War College (AWC) is a 10-month resident course for USAF, U.S. Army and USMC lieutenant colonels and colonels (pay grades O-5 and O-6), USN and USCG commanders and captains (pay grade O-5 and O-6), their international counterparts, and Department of Defense and Department of the Air Force civilian equivalents (GS-14/GM-14, GS-15/GM-15). AWC prepares students to lead in a joint, interagency and multi-national environment at the strategic level of military operations. Also known as "senior developmental education" (SDE), senior level PME, or (since 2010) phase II JPME, AWC is also available at the Pentagon and selected active USAF installations as a 10-month seminar program paralleling the academic year and course content of the resident course. It is also available via "distance learning" as a correspondence course typically requiring 18 to 24 months to complete.