There's a formal process, easy to find on the public internet, with dedicated personnel to intake off-the-street guys. There's a formal process for ISTs, but no dedicated personnel and it took a lot of google-fu to find the requirements; if you're doing the IST you need to keep pushing things along and making sure your packet doesn't get orphaned, also hopefully you're current unit is helpful. For Os, If you've had a break in service, or are planning to, you're time in grade keep building in the ready reserve and can grenade your chances depending on your current grade. For WOs you have to go to OTS. For Army pilots, you'll be rotary only unless you get hired through a SUPT board (which puts you through the off-the-street process, which, though more extensive, has more support and is a more streamlined process). I was a prior O, current WO, doing an IST. It took a year of phone calls, texts and emails between myself and the boss and the deputy before I got fed up enough (with the Army) to go over there and not leave until I talked to the commander. That was in November. My packet is finally at NGB after extensive delays, mainly unforced, but I can't access the templates and checklists that the HARMs office used to assemble the packet (not that I even knew what HARMs was until 6 weeks after the recruiter sent my info off to the group HARMs office instead of the squadrons and I went over to the squadron to ask what was going on). They also kicked it back immediately because they didn't read past the first page then asked for a bunch 'more' information, which was all already in the packet.
If I was smarter I would've at least applied to a SUPT board for the sister Herc squadron and hoped for an age waiver, but if I was smarter I wouldn't have gone to the academy in the first place.