The modified upgrades.txt attached in the post below enables the extra ammo upgrade for GE & US. It also gives GE the tactical Funkgerät upgrade and the Demo charge. Backup the original file and copy the new upgrades.txt to \Close Combat - The Bloody First\Data\Base\
Upgrades can be added to the US and Axis in the scenarios files on lines 17 & 18 respectively (the two lines above the map name). Unlike adding upgrades to \Close Combat The Bloody First\Data\Base\Units\scnunits.txt where multiple upgrades of each type cab be added (eg. 6 Demo charges), the scenario files only show one upgrade of each type ie. adding 6 Demo charges still only results in 1 available Demo charge.
Upgrade values:
14 US Grenade Launcher M1
15 US Grenade Launcher M7
16 US Thompson SMG
17 US M3 SMG
18 US Demo charge
19 US BAR
20 GE SMG
21 GE LMG
22 US LMG
23 GE Grenade Launcher
24 GE Panzerfaust
25 IT SMG
26 IT LMG
27 US Extra Ammo
28 US Radio
29 US Scout
30 GE Scout
31 IT Scouts
32 US Assault
33 GE Assault
34 US Tank Hunter
35 GE Tank Hunter
36 IT Tank Hunter
37 US Sniper
38 GE Sniper
39 IT Sniper
40 GE AT Rifle
41 US 2.36 Bazooka M1A1
42 US Bazooka M9
43 GE FJ Scout
44 GE FJ Tank Hunter
45 GE Extra Ammo
46 GE Radio
47 GE Demo Charge