Saving for a house vs retirement investing

My partner is an 0-2 , and I'm a civilian making 60k+. Our next PCS will be in 1.5 years and we will be there for 3-6 years. If the area is right we will want to buy a house, possibly starting a family. (All loans paid off for both of us other than a student loan I have for ~10k at 4%).

Currently we are on track with retirement, but I am not sure what will be best longterm. My partner has everything from tax advantage accounts maxed out. They also have enough to take care of the down payment comfortably but I want to contribute my 50% to it. I can max out my retirement tax advantage accounts, but then would only be able help with say 20ish % of the down payment.

Would it be worth me reducing my retirement savings to help with house down payment – or keep maxing retirement accounts. If we move to a higher cost of living area I will probably be making closer to 80/90k. My partner will probably be an 03 when making this move as well. Probably aiming for a house in the 300-350 range. We will be able to hit the 10% down payment but don't want our personal accounts to drop below our 6 months of expenses mark.