Who can't donate blood?

Here's a list: It's not complete. For example, when I was a student pilot, I was deferred because of concerns about handling low oxygen. http://www.redcrossblood.org/donating-blood/eligibility-requirements

American Red Cross: states one should not donate blood if they have had: previous/ current cancer, Hx of Hepatitis C or B, HIV infection or high risk for getting infected, IV/oral drug abuse, autoimmune diseases (XLE, RA, Thyrotoxicosis), some serious chronic illnesses (cardiac/ pulmonary). REF: http://www.americanredcrossblood.org/faq.html