For TAR, do you get to submit preferences for specific squadrons or only communities/platforms?
You apply to VR, VFC, VT(P), HT, VT(J), etc specifically and are picked up (or not) for that community. If you get, say, VR, my understanding you'll be asked to fill out a preference sheet and then the detailer will rack and stack with Needs of the Navy, Spouse CoLo, EFMP, etc. Smaller numbers so my buddies have said it's a bit more gentlemanly than the PERS-43 grinder, but someone has to go to Hercs in Ft Dix.
One thing I'll say is straight up cold calling the TAR Accessions and Recruitment guy/gal is a legit option. They were on the active side before and understand the dance. They aren't going to write you name down and give it to your detailer/front office if you call.