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| | [No title] (Site not responding. Last check: 2007-10-13) |
 | | N Special Test, Aircraft on special test programs by authorized Permanent activities and on bailment contract, whose configuration is so drastically changed that return of aircraft to its original configuration or conversion to standard operational configuration is beyond practicable or economical limits. |
 | | U Utility Aircraft having small payload utilized or modified to perform miscellaneous missions such as carrying cargo or passengers, towing targets, etc. V Staff Aircraft having accommodations such as chairs, tables, lounge, berths, etc., for the transportation of staff personnel. |
 | | O Observation Aircraft designed to observe (through visual or other means) and report tactical information concerning composition and disposition of enemy forces, troops, and supplies in an active combat area. |
| www.au.af.mil /au/awc/awcgate/usmchist/air.txt (9963 words) |
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