Gun Number

Watching a television commercial for the Australian military the other day, I was surprised to see that there was no mention of the "enemy". In it, a young man talked of his role as a "gun number" where he and the others in his team could have their artillery gun in place and ready to fire within a couple of minutes. Sounded easy ... although they themselves were not under fire at the time - and there was no suggestion that those recruited via the ad (for that was its purpose) would have to perform in combat conditions - yes, yes, you'd think people would work it out but it just seems this isn't (whole) truth in advertising.