Most HUD homes give buyers who will live in the home a 'first look.' This means that they won't accept investor offers for the first 30 days, they will only accept owner occupants.
And as Ryan states, it should already have an FHA appraisal for value, and for condition.
This doesn't guarantee that there are no repairs, sometimes there is a required escrow for repairs.
The buyer would be required to put money aside to insure that the repairs are completed.
HUD doesn't make repairs for the buyer, it is always an 'as is' sale.
There is no seller disclosure or Truth in Housing inspection report with HUD, they do their own condition report. You are strongly urged to have an inspection of the home before you make an offer.
Depending on what you are looking for and where, there may be other options. If you are a first time buyer it's good to have company looking at homes. if you have a friend or family member with some experience ask them to come along on a couple showings so they can point out things that you might miss.
I'm not sure what a Housing Choice Voucher is but I'm sure a simple google search can reveal the answer.