A form, time (it isn't fast), and a nominal filing fee (requests are mostly processed by humans, especially on old documents)
You may be disappointed though. When FOIA came about, plenty of "activists" requested their files, swelling with pride thinking of all the things that must be in there- only to find just one entry:
03/07/2012: Submitted FOIA request for personal file
You may be disappointed though. When FOIA came about, plenty of "activists" requested their files, swelling with pride thinking of all the things that must be in there- only to find just one entry:
03/07/2012: Submitted FOIA request for personal file