Maybe even offer to cover some closing costs to sweeten the deal if they’re stuck on a higher price.

Depending on the seller, you may sweeten the deal, by letting them know that they don't immediately need to cash out, or can partly cash out.

They arent much used.I think what you supply depends on your local market and if you sense throwing something in to sweeten the pot to win over the right tenant is a good move.

Tax Advantages: Mortgage interest and depreciation can be tax-deductible, further sweetening the deal.

I get 25k rolled into my mortgage for repairs right off the bat, which is a buffer in case of the seller countering or having to sweeten the deal.

You can even sweeten the pot by telling them they don't have to clean, and you will hand them their deposit on the day of move-out after a 10-minute inspection to verify there are no damages. 

This would be a sweetened deal if they plan to rent for a while in the place they are PCS'ing to.

This sweetens the deal for them.

Offer a buyer's compensation for their agent as well to sweeten it for someone already represented. 

It's not uncommon for buyers using FHA products to face rejected offers or the need to significantly sweeten deals to compete with those favoring conventional loans.