To start, this is a great resource, but it only has information about infantry. I've checked, a few times.
What brings me to ask this is, specifically, the MAX suit slot upgrade that provides "additional small-arms fire resistance" ranging from 1-5%. This seems like a horribly ineffective way to spend certification points, especially when compared to your other options (auto-repair and 5-25% explosive resist). HOWEVER, if the MAX already has some bullet resistance, that 5% could suddenly jump to a huge value (80% base +5% equals out to effectively 25% reduction in damage taken).
I'm also curious about tanks and planes, and their guns/resistance values/etc. How much more effective are AP vs. HEAT when fighting tanks? What kind of damage multiplier do you get for hitting the back? That sort of thing. Is there a resource that can give me this kind of information?