Escape and evasion map printed on playing cards distributed to Prisoners of War which could be soaked and pealed apart revealing the escape map. Many of the maps of the Pacific region were printed by the US Army Map Service, while the UK was responsible for many of the European Theatre maps. Many of the US Navy charts were folded in envelopes and distributed to the air crews before a mission, and to be turned in when the mission was successfully completed. They were called "drift charts" by the Navy, "...since their prime purpose was to indicate to aircrews survivors in their life rafts
Pilot certification in the United States They are required for those intending to be pilot-in-command of an aircraft under the Private or Recreational pilot certificates or while exercising solo privileges as a student pilot. To qualify for a third class medical certificate, pilots must meet the following requirements: For pilots under 40 years of age, third class medical certificates expire on the last day of the month they were issued, five years from the date of issue. The FAA changed this rule from three to five years on July 24, 2008. For all others, they expire on the last day of the month they were issued,