I think he means FM 20-22, Vehicle Recovery Operations. Look here http://www.military-info.com/MPHOTO/Manuallist/Fmarmy.htm to order a photocopy for $10. Here's the Reader's Digest version http://www.adtdl.army.mil/cgi-bin/atdl.dll/fm/21-305/Ch22.htm. FM 5-35, Engineers Field Data also has a useful chapter on vehicle recovery.

Ed