World's worst airplane disaster

About the world's worst airplane disaster at Los Rodeos airport in the
Canary Islands on Sunday 27 March 1977. Two jumbo jets (KLM Boeing 747
PH-BUF and Pan American Boeing 747, N736PA) collided on the runway
after KLM's most senior pilot Captain Jacob van Zanten commenced
takeoff without proper clearance from air traffic control. Fog,
confusing radio communication, Captain van Zanten's impatience to get
airborne (and get home before he exceeded his duty time) contributed
to 583 deaths.

I looked at http://www.airdisaster.com/special/special-pa1736.shtml

What was the role of the U.S. government and the U.S. European Command
too in the recovery and investigation efforts?

Thanks
Mike