Good morning, magenta4842372 and welcome to our Support Community!
Thank you for your service to our country! Now's the time to take advantage of all of the deals we have available to military members. If you're not already on the T-Mobile One Military plan, I definitely recommend getting in on that deal. You can read more info about the plan here. As far as purchasing a new Samsung Galaxy device, if you have a postpaid plan, the G6 is not available, however, we have a promo going on for the S8 Active, S9, and S9+ that you can check out here. If you choose to purchase one of those newer Samsung devices, you're likely to get a better deal (if qualified) compared to purchasing the Galaxy S6 in full from our prepaid site. Here's what you would be looking at for the Galaxy S6:
Please let me know if you have any questions after looking over the info I sent.