I was drafted and after 5 days of testing, immunizations, and such, took the SF test. I was then discharged and re-enlisted as a volunteer for SF (12B changed to 91B after completing Phase 1). The BIG threat of not finishing SFTG was to be sent to the Eighty-Twice (11B), 20th Engineer Brigade (12B), the 44th Medical Brigade (91B), or the 50th Signal Battalion (05B). And if you REALLY pissed somebody off, you got sent to the Tilted Shithouse (1st Corps Support Command).
Richard