My answer is going to focus mostly on heightened senses. I think psychical build would be a lean 230-250 lb build (Like an NFL running back). But with guns you just need to be quick and strong enough to move with equipment, you won't be sprinting into battlefield.
Senses alone can change everything, especially ontop of the psychological level as in <PERSON> post.
Hearing
Lets first say the one of the genetic mutations would be allowing soldiers to use their vocal cords well below and above normal hearing capabilities (<PERSON> can reach notes as low as G-7 (0.189Hz)). With extremely heightened hearing, it could be a form of communication. As when elephants flap their ears and produce sounds lower than what a human can here or produce a high pitch thousands of decibels above normal hearing. With such control over voice and hearing, a fraction of a decibel could be a different command. Not mention the ability to hear conversation from distances away, possibly hear conversations through walls! It's hard to say the limitations of a genetically modified ear. Also echo location (Like some blind humans have already started to perfect) would be possible now. This would make water no longer a concern if it came down to it.
Smell This can come in handy for smelling out bombs! Dogs can do, now can these super soldiers. 350
Also like dogs, the smell can be used to track people, follow their scent track. With smell, it would be easy to identify your fellow soldiers. Also humans release hormones when they lie, so you could smell someone lying and take proper action.
Sight Sight would be able to be adjusted, 20/20 vision is no longer perfect because eyes would now be able to adjusted to need for varying distances. The ability for eyes to follow objects would be like watching a gunshot in slowmotion. One of these soldiers could slice a bullet out of the air with sword with the abilities they have! There is possibility of being able to see better colors, seeing in the dark and seeing in different spectrums!
Touch The ability to feel vibration in the earth would be great help in combat situations. You could feel footsteps of people or vehicles driving towards them. Also touching anything in the world would be like reading brail. So every object touched would be like fingerprint in the world!
Taste Like a snake you can taste your way around! I think this will also fall under being better because smell is better.
(Sorry the list got shorter towards the end! I'll edit later, but I have to go for now! If any one wants to add comments that would sound cool for super senses I'll add them in when I pop on later tonight!)
There is also other sensors that could be added that other animals have that humans normally don't. Like detecting electricity, infrared, accelerated perception(Basically slowing down time in the soldiers eyes) maybe comes with heightened sight? Just extra thoughts. 802