What you assume to mean that
hot chicks are going to remove your
underpants and "show you a good time" as a reward for your
undertaking a dangerous wartime-endeavor, whereas in reality it merely refers to your military superiors' having you recount to them the important details of what happened during your mission.
The term "debriefing" can have a similar "
getting up false hopes of pleasures/gifts" effect that the sadly-misleading phrase "tobacco-free campus" may produce --- you expect that something
wonderful is being offered if you consent to or succeed in some arduous/dangerous actions, but in reality you end up
getting nothing whatsoever of tangible reward for all of your feverish ass-busting! What a lousy rip-off!