Idiots delight. File claim. Do not, I repeat, do not submit any post -service medical records to prove chronicity even if asked twice by the VARO. Do not help VA develop your case. Admit that both your brothers were in the military and they, too, have HCV. Proudly declare you were a firefighter with no medical risks for contraction of the disease. Pretend to be Dr. Kildare and blame the jetguns. Drink lots of adult beverages and make sure VA knows about it. Change your story a few time to keep them off balance.
P.S. Make sure your nexus /IMO is vague, plagiarized from the VA examiner or otherwise hopelessly compromised by no conjecture or reasoned thought for its rationale.