7 rifles
Re with sweeper
3 jacksons
Would love to see anyone do the popcap count and munitions cost on that
Pop for 7 rifles: 49 (7*7), -73.5 manpower per minute
1 Rear Echelon: 5/6 (6 w/ 5 squad members), -7.5/-9 manpower per minute
3 Jacksons: 42 (14*3), -63 manpower per minute
In total, 96-97 popcap, not including likely major/ambulance
As for munitions:
I'm assuming double BARs since OP did not specify what upgrades that had, only that they were fully upgraded.
Rifles: 7*(60*2)=840 munitions
Rear Echelon: 30 munitions
In total, 870 munitions to equip squads fully.
Total manpower cost (no teching included): 3210 manpower (7 rifles, 1 rear echelon, 3 Jacksons)
Total fuel cost (no teching included): 375 fuel (3 Jacksons)
Total munitions cost: 870 munitions (see above)
Let me know if there are any calculation errors