I don't understand why any entity would DQ someone for such a petty, uncontrollable offense like an indeterminate blood test result. I don't harbor any infectious diseases. I donate blood regularly and those samples are tested, nothing ever turns up. Being barred from the military due to an offense which does not harm anyone and which is, again, not in my control feels un-American.
You will not be deployable if you aren't determined to be HIV negative... additionally, the military typically only stocks its blood supply from military donors... If they can't determine you are HIV negative they risk infecting other service members if you donated into their blood bank.