Have the option to continue with High 3 or opt into BRS

Reservist with 8 years of service (roughly 2 active duty equivalent) and now commissioned. I have a flight contract so I’m guaranteed to do 20 (not all AD years though).

Trying to figure out if I should continue with the high 3 or opt into BRS. I’m not entirely sure how my reservist years impact either retirement system.

I didn’t know any better when the decision to opt in came around, now that I’m a little older that 4% match sounds very enticing even though I’ll do the full 20. High 3 seems to only make sense with the numbers if I allocate 100% of my pension to TSP.

Any suggestions?