This manual implements Air Force Policy Directive (AFPD) 15-1, Atmospheric and Space Environmental Support. It also implements Federal Meteorological Handbook No. 1 (FCM-H1) and the World Meteorological Organization (WMO) Manual on Codes, Volume I.1, Part A (WMO 306, Vol I.1, Part A) aerodrome routine meteorological reports (FM-15 METAR) and aerodrome special meteorological reports (FM-16 SPECI) codes. It prescribes basic observing fundamentals and terms and establishes aviation code forms for recording and disseminating weather observations. It applies to all Active and Reserve Component organizations conducting weather operations, including government-contracted weather operations if stated in the Statement of Work or Performance Work Statement.