The specific part of moving from second to the third level that stood in the way of Keith Nolan is:
The Hearing test
<h3>What is a Test?</h3>
This refers to the use of obstacles or hurdles to check whether a person is fit to go to the next level or it can also come as a form of assessing the mental or physical ability of a person.
With this in mind and from the complete question, we can see that Keith Nolan is undergoing a ROTC training and the specific part where he was to pass to get to the third level was the hearing test.
True because it would lead United states into wars with countries they may not have planned to be at war with and there will be more united states citizens that our country man not be able to control.
