I’ve used all the rental cashflow since I started investing to buy more and more houses, or to pay off 401k loans and 0% interest for a year credit card loans to scale up.

Backstory: 22 years old about to get out of military after first contract. 70k cash saved up & 775 credit score, no debt.

Can her status and credit be of help as well?

One option is to give the front house a credit for water based on averages, but I don't know if I would agree to that as a tenant. 

You are likely blending PMLs with HMLs here, most PMLs lend on a relationship basis and most HMLs underwrite the credit profile and risk of a deal. 

Actually I have had two applicants so far with great credit scores but couldn't provide bank statement showing rent payment history.

Assumption by an EntityUnfortunately, assuming a VA loan directly through a legal entity (such as an LLC, corporation, or trust) is typically not allowed because:Primary Residence Requirement: VA loans are designed for owner-occupied properties, meaning the assuming borrower must intend to live in the property as their primary residence.Credit Review: The VA and lender require the assuming party to undergo a personal credit and income review to ensure repayment ability, which entities cannot satisfy.3.

@Jeremy C.I looked at their (JLL's) website and see that they have a history dating back to 1783 in London England and have offices in DE, MS, DC, & VA.

Both of these financing can be obtained as long as you have good credit. 

This is the biggest need in history for the wealthiest generation in history.