It really depends upon how broadly you define "Law enforcement." Only
the National Guard with a specific declaration by the states can
exercise the police powers of arrest and detention.

The active duty troops direct traffic and do other things done by the
police that look and smell like law enforcement, but lack any criminal
justice power to enforce their orders.

"Doof" wrote in message
...

"Philip S." wrote in message
...
in article ,
cjcampbell
at wrote on 9/6/05 3:31 AM:



People who are not Americans may not know this, but federal troops
are
actually prohibited from performing law enforcement duties.

Except when the president calls on them to do so. The first President
Bush
sent the Guard, the Army and the Marines into L.A. in 1992 during the
riots.
Every president has the power to do so.

Only upon request by the local officials.