Those "Vismod" UH-1 were used at the U.S. Army's National Training Center for a number of years as the Opposing Force aviation force. The picture by NoBarrelRollsshows all of the MILES (laser engagement system) on the aircraft. The pod on the weapon mount was used to "shoot" various laser codes to replicate different weapons. The studded strap across the nose were the sensors used to register laser hits against the aircraft. Because the crews knew the terrain so well they had a bad habit of showing up unexpectedly from positions one would not have expected.
@RavenOne - The Observer/Controllers (evaluators) at the U.S. Army Training Centers are now using UH-72. Some of them have been painted in "OPFOR" color to be used for threat helicopter occasionally during training events. I don't know if they are rigged to carry the laser engagement systems such as is on the picture of the UH-1H above.