The National Parks Service and U.S. Forrest Service are actively used as fronts for all sorts of clandestine activities. This would be why there is a massive lynch pin in cooperation from these entities in regards to FOIA.

http://www.fromthewilderness.net/free/pandora/forest_service_c130s.html

Eitel, who has testified as an expert witness in several civil and criminal cases, is now representing the U.S. Government as a private citizen in a civil action charging the Forest Service and CIA with defrauding the American people of close to $80 million dollars in the illegal transfer of 35 C-130 aircraft to a number of private firms. These firms serve as contractors to the Forest Service. The aircraft transfer program, begun in 1987, was intended to give private contractors serviceable aircraft in exchange for worn out ones to help the Forest Service fight fires as converted air tankers. Instead they have turned up all over the world on covert operations. A few have been caught full of drugs as recently as 1996.