One of the most frustrating things happened to me yesterday...
I was the US playing Karkand and, somehow, the two of the enemy's got ahold of our only tank and apc... so all they did was post at our base and spawn kill like crazy. I must have gotten killed like 6 times by them (I know it's partly my fault for spawning there knowing they're there), but I really wanted to AT their candy-###es. They sat there side by side past the scan center out in the boonies so you wouldn't be able to sneek up behind them.
After I was able to hit one of them with a few rockets, it didn't take me long to realize they were both mechanics.... I tried to get a few guys to AT up and hit one of them with 3-4 rockets at once, but no-one wanted to play along.
I just gave up and took my battle into town.