You have a lot of strong arguments. I would advise you to read Eisenhower’s farewell address where he specifically warned against the Military Industrial Complex.
I have spoken to a lot of Veterans who have said things like “war is the health of the economy” and “how do we know the weapons work if we don’t test them in actual wars.
The career of Dick Cheney is a classic case of the revolving door between the defense department, military contractors, and the Vice Presidency. Remember he was one of the loudest voices calling for the invasion of Iraq.
Of course Trump was changing the subject, but his actual statement wasn’t all that absurd.