FBI are cool and I really like the department but in gaminglight your RP purpose is to investigate things etc, you can investigate bank raids also but at NO point should you be allowed to take the Job of SRT, SWAT, CERT and CAT. They are trained for that and have the armor for it. Look at the FBI character, some overweight guy, it's obvious that he's not built for that. SRT / CERT/ SWAT / CAT Have tons and tons of armor, have all the equipment needed, the training and the discipline needed for that.
Since FBI is a pay to play rank I also don't think it's a good idea to give new PA's any kind of say over the bank, to be brutally honest, half of them don't even know what tazer rushing is.
*Also, I think an OFC has more of a reasoning to be at bank than FBI. an OFC's (or any other PD) job is to do crowd control and control traffic. FBI's job should only to be investigate afterwards, if shots are fired then you may respond (but still not move in till told otherwise of course)*
Hope you understand my views, wasn't trying to come off as mean but I have many strong opinions on this situation.