What year is this? I´d guess late 50´s early 60´s but could be totally wrong.

YouTube - LSD Testing (British Troops)

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I love that vid Kai, saw it a few years back. The bloke climbing the tree is fantastic, particularly considering one my my mates was found hiding in a tree on exercise once.

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There's no honorable way to kill, no gentle way to destroy. There is nothing good in war. Except its ending.

It is indeed a classic, though I can't find a solid date on when the testing went on, if I recall it was indeed early 60's.
There was (and likely remains) a strong military interest in such chemical agents as passive weapons. Hard to aim a rifle when your entire unit's either giggling uncontrollably or busy discussing the great unified theory of everything .

YouTube - American military LSD experiment
YouTube - Czechoslovak Military LSD experiment

Cheers,
Adam.

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"Wars cannot be fought with dream stuff" - Sir Percy Hobart.