Here's the makeup and cost of a standard infantry platoon based on GURPS Ogre. This is based entirely on equipment, exclusive of training and support.

Standard Infantry

Item Cost
Standard Infantry Battlesuit $329,870
Gauss Gun, 3mm 9,740
HEAT Launcher, 100mm 31,100
Emergency Survival Kit 800
Total 371,510

Squad Leader

Item Cost
Standard Infantry Battlesuit $329,870
Heavy Gauss Gun, 5mm 41,700
HEAT Launcher, 100mm 31,100
Emergency Survival Kit 800
Total 403,470

Platoon Leader

Item Cost
Command Battlesuit $329,870
Heavy Gauss Gun, 5mm 41,700
HEAT Launcher, 100mm 31,100
Emergency Survival Kit 800
Total 403,470

Platoon Assets

Item Cost
Personal Guass Cannon $113,000
PGC Ammo, 2 magazines 4,880
HEAT Ammo, 12 cassettes 45,600
Splat guns, 3 10,500
Total 173,980

Total Platoon Cost

Item Cost
Troopers, 9 $3,343,590
Squad Leaders, 2 806,940
Platoon Leader 403,470
Platoon Assets 173,980
Total 4,727,980