There is a video to see online (you can search for it on youtube) of - I believe - British soldiers who are fed LSD. They become disinterested in following orders and maintaining proper composure for war situations and instead walk around laughing and hang from the trees. So if that answers your question, the answer would (again) be no.
I can only imagine a low dose of a psychedelic amphetamine to be nootropic to enhance clarity and rational thought but as the dosage increases to achieve this so do the psychedelic effects that at some point would interfere with proper judgement. I don't think any outfit would risk having the unpredictable consequences of tripping soldiers.
Of course, some
indigeous cultures (as in: certain non-First World tribes and the like) would not entirely agree with all of this. Some of these cultures still exist today like some Amazonian tribes in South America for example, they consider ayahuasca (i.e. orally activated DMT and other plant alkaloids they use) to be of special importance in hunting because it makes them become 'one with nature' and see more clearly. We could argue about whether hallucinated elements are truly helpful but apparently they have learned to properly use it as a tool and it may possibly help with
visual accuity.
Traditionally, the liquid was taken by men before going out to hunt, to put them in touch with the spirits of their prey.
(
http://www.globalpost.com/dispatch/news/regions/americas/111230/ayahuasca-amazon-drug-trip)
Psilocybin which is found in magic mushrooms is also known to enhance visual accuity. Again, at full doses one would expect the trip to negate the possible benefits of this in practical application since psychedelic effects could (or probably would) become distracting. But at lower doses it may be possible to
Peyote, a mescaline-containing cactus is a part of cultural use for hunting purposes as well:
The Tarahumara Indians consume small amounts of peyote to combat hunger, thirst and exhaustion especially while hunting. They have been known to run for days after a Deer with no food, water or rest.
(
http://www.erowid.org/plants/peyote/peyote_cactus_guide.shtml)
Amanita mushrooms, quite different from 'magic mushrooms' and having many side-effects that I would consider quite heavy, have also been used historically by
Berserkers. I am not sure how much evidence there actually is for this but they were apparently notorious warriors who would become enraged before battle, it is said by consuming psychoactives like Amanitas. This would produce a delerium-like trance state that would allow them to rage on, hard and for a long period.
One could argue that these historical uses of psychedelics or hallucinogens are imperfect and that despite the endurance some may provide the mental effects can very well be counterproductive to clear thinking in battle. Such cultures may simply select the psychoactives they do because no tools that are more selective in effect are or were available. On the other hand, what is 'clear thinking' can be seen as an equally modern principle. Modern warfare is more organised and psychoactives to aid this would have to support this. "Ancient" warfare may (I guess) often considered much more simple in strategy and straight-forward full-on attack mode. Whether such strategies are adapted to the nature of the warrior's/soldier's inebriation (as a direct result of the particular effects of the psychoactives used) or the other way around is a good question and this probably differs per culture and per drug.
The thread-starter is welcome to indicate his question is answered by the posts thus far, and everyone here is welcome to elaborate on the discussion or just the opposite of that.
*OP was edited for spelling and the thread title is formulated in a more transparant way