It is much more plausible that the military is merely a tool for Congress and the White House to enact their foreign-policy desires. "Defending American interests abroad" explains the last 200 years far better than "defending freedoms at home." Unfortunately, Congress and the White House lost track of the fact that entangling alliances with none, and free trade with all, furthers individual Americans' interests more successfully than the policy we've embraced since Jefferson: Entangling alliances with whomever, free trade only with those with whom we have entangling alliances.
With that, I certainly agree.