Nilet, this is copied directly from the appointee instructions:
Footwear
By the time you arrive at the boot issue station on in-processing day, you will have been on your feet for many hours and your feet will be swollen and tired. To ensure a perfect fit and to lower the risk of blisters, it is HIGHLY RECOMMENDED that you purchase 1 pair of ABU boots and wear them for 2-4 weeks prior to arrival at USAFA. These boots must meet the following specifications: sage green in color, 8 inches high, have a rubber sole, and a waterproof upper bootie (Gore-tex or similar). The boots must NOT have steel or safety toes, or zippers. Bellville models 650 (men’s) and F650 (women’s) and 690 (unisex)
www.bellevilleboot.com are known to meet these requirements. All incoming cadets will be issued sufficient boots to ensure that they have two (2) pairs of serviceable boots for wear during BCT.
You are also encouraged to bring molded cleats with you to the Academy. Many intramural activities are played outdoors and the use of molded cleats will allow you to maintain your footing. Only molded cleats are authorized. Do not bring screw-in, metal, or single toe cleats as they pose safety hazards to other participants.
This is in direct contrast to what you are saying, so there is no wonder appointees are confused. If cadets will be issued either the 650 or 690, then if they bring 650 or 690, it seems they will be able to wear them, no???