"D" key question

[WBWilder]

This is a question I have. Many weapons cannot be seen when I want to replace one. For example, the 105M2. Even when I want to lower the ammo, I have to first type in the weapon number...but the weapon is not listed.

So tell a dumb guy one more time, how do I access the complete list of weapons for each country and how do I get whatever software I need to do that. As it is now, it is very frustrating.

WB