This video is truly amazing. The British had an entire unit take LSD to see how they performed after dropping acid. With one soldier climbing a tree to feed a bird and the commander rolling around laughing, the unit was ready more for Woodstock than Waterloo.
Presumably, the idea behind the exercise was to see the advantage of drugging opposing armies. This would simply require luring whole army divisions to rock concerts and slipping them LSD during the performances. You then have a division composed of Timothy Learys.
Here is the new divisional song for the Coldstream Guards: