First, the ANG/Reserve UPT route is unsurpassed, you will NOT regret it. I had more applicants have problems with color vision than acuity. Not sure why, but the current color vision test is tough. Funny, even the RAAF (Aussie AF) candidates have trouble with it. Acuity shouldn't be a problem, do not take the surgery route until you are positive you are having the waiver able procedure done, that every bit of it is reviewed and approved. My nephew had it done and had no problems getting into Navy UPT even after being rejected by the Canoe U.

I've sponsored probably 20 candidates from a C-5 unit, only one washed out, IIRC and that was in OCS. It is competitive and the Guard/Reserve only selects those with outstanding chances to graduate.

The C-5 is fine, but not the best place to get good stick and rudder skills. Too much droning on autopilot. I'd jump at a fighter slot, if you are a competitive sort. Better basic flying training. I flew the F-100 and A-10 first and the lessons learned there have stuck with me. Medical drove me to the C-5. One thing, you will get more hours and pay in any of the heavies--the C-17 is probably the best now.

Find a unit or units and a mission you like and don't let go until selected. Some units are more interested in UPT candidates than others; a visit or two will tell you about them.