1-1 PC is gone BC they were so "successful" last year. 1-3 traditional PC has been around and people have been getting approved with it for years.
Two keys
1. Have a position number and/or hiring letter for an ANG/Res unit. Though not required for officers, you won't get approved without.
2. Know the manning level for your year group/AFSC at Sq/Wg/MAJCOM level. If you're in a critically manned block, odds of approval are lower.
Good luck and know that it's hard to turn back from PC. Once you submit, you will be viewed as a short-timer and move to bottom of list for good things (promo/assignments/awards/jobs) and top for a 365. If you can handle all this, it is totally worth it when you get to the other side.
AFPC functional policy is to not recommend any PC asking for anything above 12 mos. Doesn't mean SAF/PC office won't approve anyway, but better chance if you're asking for 12 mos or less.