I echo what Ryan M. said - I've missed HUD and FNMA properties because they sold during the "exclusive (OO) periods" before I, as an investor, had a chance to bid on them. In fact, it is happening to me right now on a property.
If you bought the home as an owner occupant then it is the law that you occupy as a primary residence for 1 year. If you are just starting your RE investment journey, I think it is best to start that journey along the right road.
William Keith - the HUD rules are tied to the property, not the loan. HUD wants to allow sufficient time for prospective homeowners to not have to compete with investors to acquire HUD properties (other government agencies [FNMA, VA, etc) have similar exclusive periods.
That said, if you get a mortgage as an owner-occupant in order to take advantage of the lower rate (as compared to an investor), but do not fulfill the occupancy requirements of the mortgage, it could be cause for the lender to demand repayment of the note in full.