Professional Recommendation rates ebb and flow for all officer communities. In the past the Supply community ratio of applicants vs. available slots caused the board to be quite competitive. This is not the case right now. I encourage everyone to put your package together and apply to the board if you’re interested.
The NRC used to be very good about getting out the selection rates of all the designators, when they did some organizational changes it became spotty at best, I feel that is more due to the communication from NRC down to the the OR's than anything else.
I would say competitive rates due vary but also what is considered competitive from one person to another will vary, I would consider competitive to be anything under 30% selection rate. The boards were quite brutal when the selection rate was running around 20%, if there was a reason to cut an applicant to make the selections easier it happened, that is how SWO became so popular lol.