Having been previously recruited for the Diveristy Visitation Program in September, I can confirm that the academy DOES actively seek out all opportunities to appoint minorities. For example, due to my ethnic and socio-economic background, I was flown out, given one on one counselor help, and follows up until my appointment arrived. However, I believe you should answer all questions on the application because "diversity" at the academy is far different than diversity for us normal folk. USAFA considers many aspects such as financial status, location, ethnicity, and far more. Be complete and honest and let them do the deciphering!
Best of luck.