With respect to Jim Mattis’ resignation letter (transcribed here): It is noteworthy that he devotes his longest paragraph, and the first one of substance, to a “globalist” vision of America’s relationship with the world:
One core belief I have always held is that our strength as a nation is inextricably linked to the strength of our unique and comprehensive system of alliances and partnerships. While the US remains the indispensable nation in the free world, we cannot protect our interests or serve that role effectively without maintaining strong alliances and showing respect to those allies. Like you, I have said from the beginning that the armed forces of the United States should not be the policeman of the world. Instead, we must use all tools of American power to provide for the common defense, including providing effective leadership to our alliances. NATO’s 29 democracies demonstrated that strength in their commitment to fighting alongside us following the 9/11 attack on America. The Defeat-ISIS coalition of 74 nations is further proof.
Setting aside the usual idealism about America’s role as a guarantor of freedom, the pragmatism underpinning this argument is unsurprising to anyone that knows U.S. history.
Even before this country was born, its foreign policy proved pivotal to its success and survival. It was the alliance with France—the first country to recognize our independence, and the only one that could challenge Great Britain—that was most decisive in securing victory in the Revolutionary War. Nearly all the Founders recognized the importance of international trade, commerce, and recognition, which provided economic growth as well as legitimacy. Hence the Constitution places great importance on international agreements (the Treaty Clause), elevates ratified treaties to the same binding force as domestic law (the Supremacy Clause), and has language apparently obligating America to enforce the “law of nations” (the Offenses Clause).
Contrary to popular belief, the top brass has always recognized this: Far from being jingoistic, many of them are well versed in international relations and world history. Some of the most noteworthy military leaders today—Mattis himself, David Petraeus, James Stavridis—studied international affairs, foreign policy, and other internationalist “soft” sciences.
Like it or not, our highly globalized world does not permit us to disregard alliances and cooperation. The people most involved in our national security recognize that.