What is the best road to federal law enforcement?

I am in The USAF dep. I have not recieved a job yet and I put security forces as my first selection. I am joining the air force for a few reasons including to serve my country and to gain some discipline. The main reason is for experience to get me into federal law enforcement like the FBI. My issue is that the security forces afsc only requires a 33 general asvab score and I scored a 77 overall score. I still have a chance to change my job. Would security forces be good for me or should I look into another afsc? If yes, then what other afsc can help me with law enforcement?