Does our government really do "killing" that well?

Some people like to point out as an example of how well government can do by pointing at our military.

So, about the government being good at killing people, a couple of points.

The material that they are working with 'American Men', already a very killing people.

The budget that they are working with, 'gigantic'.

Also,
The last war that we got into without really having a standing army was WW2.
That was also the last war that we unequivocally won.
WW2 and every war prior to that we did unequivocally win. So really how well is the government doing with that?