VA & USDA isn't for investment properties, only primary residences. However it's possible you can buy a multi-unit property with FHA or VA financing, and only have to occupy one unit, and then the other units could be rentals.
As far as the question pertaining to 100% financing on investment properties, the purchase price would need to be well under the actual fair market value of the property (to where there is at least 35-40% equity), and then some private/hard money lenders could be interested in financing 100% of the purchase price. I know of a private lender in Texas who will do that in conjunction with rehab funds, but none in Louisiana.
Shane Milne | Lending in all 50 states | NMLS #81195