why did Ned find boot camp relatively easy, and what did Ned not like in the book camp training?

Ned and his fellow Navajos find boot camp easy because they are used to walking long distance with weight on their backs and doing other physical activities. Many of the white boys who joined at the same time fail to finish boot camp, but all the Navajos make it through. For Ned, it is also a lesson in dealing with white people. He has trouble understanding them.