Tanks.

They're not a problem. With three missiles, you can take it down in 30 seconds. With a team of four, it only takes 10 seconds. The problem is that the players don't know how to play. 

Learn how to play and you dont have this problem. Simple.

I've noticed that practically nobody repairs tanks in REDSEC so they are extremely easy to take out, even solo. Not really worth 3ish missions to obtain in my opinion, especially when the game automatically drops anti-vehicle caches for players 

I'm sorry I can't agree.  People basically abusing tanks.

Oh yes those missiles so easy to collect right?  Why don't you learn to discuss rather than just shut someone down with the 'Learn how to play'.

This is why multiplayer gaming is dying - too many trolls.

Why don't you try listening to what they say instead?
I just finished a match where there were two anti-tank supply crates 150 meters apart (in boutique zone). My teammate and I were engineers. When we saw not one but two tanks, we took them down immediately. It only cost us 3 armors.

I repeat, learn how to play and use the brain.

The point is - you got lucky - if you didnt get to those drops you are basically screwed.  Consider that not everyone wants to play AT.