Let’s pause for a moment and focus on that intent: I’m going to take LSD in a war zone.
It’s like the psychedelic revolution smashed right into The Right Stuff test pilot daredevil attitude. Some people truly seem to be made different than you and me.
That said, it probably wasn’t one of those legendary “heroic doses”, as a certain low-to-medium range (which varies from person to person) does sharpen awareness of things we normally filter out automatically.
If this guy did LSD in a war zone, he’s probably done it many times before, is familiar with its’ effects, a medium dose for him might be a heavy one for the rest of us… mere mortals.