From Air Force Instruction 31-101 (volume 1), "Physical
Security" which contains a wealth of new information on security for
classified programs. One thing that's particularly disturbing is the
following:

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1.12.  National Defense Area (NDA).  NDAs contain and secure Federal Government
resources in US and US territorial areas that don't fall under the jurisdiction
of the DoD.  The AF may need to establish an NDA if:
* Aircraft are sent to civilian airports.
* An aircraft carrying nuclear weapons makes an emergency landing.
* It is necessary to temporarily immobilize nuclear weapons ground convoys.
* An aircraft crashes.
* Another unplanned emergency occurs.

1.12.1.  Establishing NDAs.  Installation commanders, through their on-scene
commanders, establish NDAs.  Minimum requirements for establishing an NDA are:
* Use a temporary barrier to mark the boundary of the area.
* post Air Force Visual Aid (AFVA) 207-14, Restricted Area Sign-National
  Defense, August  1990.
* Explain the situation to landowners, including why you need to set up the
  area and the kinds of controls that are in effect.
* Get the consent and cooperation of the landowner if at all possible, but

  establish the area with or without consent.
* To the greatest degree possible, let civilian authorities handle civilian
  arrest and detention.  If local civil authorities are not present, military
personnel may apprehend and detain violators or trespassers.  Work with the
judge advocate representative to release violators and trespassers to proper
authorities.

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Paul McGinnis / TRADER@cup.portal.com / PaulMcG@aol.com