First and foremost thanks for your service. Men and women such as yourself make it possible for us to even HAVE these discussions! THANK YOU!!
Technical aspects of setting up a rifle aside, I think you need to first ask yourself what are you going to do THE MOST with your rig? General purpose hunting rifle with long range capability? Dedicated long range hunting? Still hunting in the NY woods? Just my humble opinion, but if I were you I would first consider all of the parameters of its use before you make a decision.
Setting up a Sendero with a huge 3lb Nightforce, a bipod and possibly swapping out the stock for a more tactical shooting opriented one is going to be a big burden and hinderance while prowling around the woods in NY. However, conversely, opting for lightweight, whippy barreled Kimber that would be outstanding in the the NY white tail woods and scoping it with a 2-7 Nikon is going to limit you if you go on a Wyoming antelope hunt
where you may opt to shoot at 500+ yards. Not as much as lugging a massive, heavy barreled rifle around with a 5-20 scope on it is going to be in the woods, but, do you see what I mean?
With what you wrote, if I'm reading it correctly, I personally would research more sporter weight rifles in a good, all around calibers and stay in the 4-12, or 4-16 magnification range with scope possessing a good, uncluttered, but useable ranging reticle. But the advice of spending as much as you can on optics is a solid recommendation. Look in to rifles with awesome accuracy reputations such as Tikkas, Sakos, TC Icons and Savages, but again if I were you I would stay with the sporter weights, or medium heavy sporter weights in a long range capable caliber unless you are just wanting to set up a dedicated LR rifle. It DOESN'T HAVE TO have a heavy, or bull barrel, and weigh 15 lbs. to hunt with at long(er) ranges. It DOES have to be accurate to begin with though and now days there are plenty of factory choices that are PLENTY accurate to hunt with at longer ranges. Whatever you get, marine, SHOOT IT and SHOOT IT SOME MORE. Then go back and SHOOT IT SOME MORE. Know the rifle and it's capabilities ( as well as yours ) and you will do well. Saying what I'm about to on this site will probably result in rotten tomatoes being thrown at me, with hissing boooos included, but there is nothing wrong with a .270 Winchester. I've seen some longer(er) range miracles performed with it. It doesn't need to be a .300 Scud Killer Magnum, or .338 Abrahams Stopper to shoot long, especially in the hunting arena. Those bigger rounds most certainly have their merits if you are setting up the perfect, dedicated LR rifle, though. If you WANT to shoot deer at 1200 yards though, you better get the Abrahams Stopper simply for the ranging capability. But do you want to shoot NY white tails at 64 yards with it too? Those are just questions I would ask myself. To each their own.
Just some advice from someone whos been in your shoes....more than a couple times. Good luck and come home safe Devil Dog !! Some of us have your six covered here till then.