My military experience is limited to a couple years defending England in the Territorial Army Reserve, so I'll not comment on skills except to agree that for green troops physical fitness is emphasised, along with ability to service & maintain one's rifle, and drill to obey orders unquestioningly, more than rifle accuracy. We got quite a lot of training in simple squad tactics like Bounding Overwatch and assaulting through a position (assumed that attacker will have 3:1 superiority, of course IRL this is often not the case - in the Falklands War 3000 Paras & Marines unsupported by artillery or air power attacked & defeated 8000 Argentine conscripts in entrenched positions. Weapons drill was geared much more to ensuring that guns remained serviceable and that we'd point & fire them in the right direction, it seemed to me - volume of fire more than accuracy. Combat training was almost always at night, so Blind-Fighting feat might be appropriate?
Re levels - this will depend on general NPC level distribution for your game, eg in Traveller20 the 'average' NPC is 6th level. I use (adapted from Traveller: The New Era):
Novice/Conscript: 1st
Trained: 2nd
Experienced: 3rd
Veteran: 4th
Elite: 5th
(Major Heroes/Villains: 6th+)
This is the level of the 1st 50% of the unit. 25% 1 level higher, 12.5% 2 levels, 6.25% 3 levels, etc. So at the very top of the scale, an Elite SAS Company of 100 men would have something like 50 5th, 25 6th, 12 7th, 6 8th, 3 9th, 2 10th, 1 11th, 1 12th.
Re levels - this will depend on general NPC level distribution for your game, eg in Traveller20 the 'average' NPC is 6th level. I use (adapted from Traveller: The New Era):
Novice/Conscript: 1st
Trained: 2nd
Experienced: 3rd
Veteran: 4th
Elite: 5th
(Major Heroes/Villains: 6th+)
This is the level of the 1st 50% of the unit. 25% 1 level higher, 12.5% 2 levels, 6.25% 3 levels, etc. So at the very top of the scale, an Elite SAS Company of 100 men would have something like 50 5th, 25 6th, 12 7th, 6 8th, 3 9th, 2 10th, 1 11th, 1 12th.