I want to go active duty but have commissioned with the GRFD scholarship. Is it possible to switch?

To my knowledge, it is not possible to switch because you have already commissioned and state military paid for your schooling. While I am not doing ROTC cadre duty anymore, I believe your commitment is to reserves based on scholarship source.

I would recommend talking with your USAR / ARNG unit commander just to be sure. If you cannot switch to active duty, you may consider switching units to voluntarily mobilize for a short term after completing BOLC.

2LT (Join to see), you must first complete your Military Service Obligation (MSO) associated with your GRFD scholarship by serving eight years in the National Guard, then you may apply for the Call to Active Duty Program (CAD) through HRC.

AGREEMENT OF GRFD SCHOLARSHIP, CC Form 203-R:
As a GRFD Scholarship Cadet (including Military Junior College cadets), I agree to the following:
3.c.: " I may not revoke this GRFD endorsement and apply for accession into active duty"
3.d: "If I am a Dedicated Army National Guard Scholarship Cadet (including Military Junior College (MJC) cadets), I further understand and agree that upon commissioning, my military service obligation, after an initial ADT period, can only be fulfilled through service in the Army National Guard (ARNG)."