Does military service have the power to desensitize a service members "feelings" in general?

I was reading an article on how military members, men in particular, can be desensitized to face-to-face interaction due to the use of social media being the most convenient way of communication while deployed. It made me ponder a thought: does prolonged military service have the power to desensitize a service members "feelings" in general? I'm not referring to violence here. Since pretty much Day 1 of BCT and even the moment we have our first difficult time at our first duty stations we are always told "suck it up". Could it be that this becomes engraved so deep in our hearts and mind that we approach everything in life in life this way? I know in one way it really can be seen as "building character". Just today a young PFC in my unit was whining about having to take the garbage out because another PFC didn't take it out. This kid was literally heated over it. I just finished my first deployment where I spent the majority of the time cleaning up after others and disposing of junk. It honestly made me just laugh how he was so mad considering I had just spent almost 9 months doing the same thing without a peep. Maybe you can see the relation between the situation and feelings. What about when you're talking about human emotions and relationships and the things you enjoy? The Army in particular can make promises but in a organization where mission comes first, it's just the nature of the beast that a lot of "promises" always get broken. Could it be that we get so used to disappointment that we just treat disappointment in other areas of our life as a non-issue? Back to the side of always being told to "suck it up": do we become immune to feeling a certain way towards things that used to make us happy because we're so used to not expressing feelings? Could that possibly affect how we see a potential relationship or even relationships we already have with a spouse or significant other? I know the question is a little skiddish and might not make much sense just tried to describe it the best way I could. Would love to read your thoughts, if any.