By enthroning an incompetent, clueless leader in the Oval Office? I do see your point in part. IF Trump's approach to the military is one of benign neglect, I think we can count on solid leadership from Secretary Mattis and 'mo money from Congress (for at least the next two years). If Trump tries to actually be substantively involved in defense policy (with the psychopath General Flynn whispering in his ear) I fear for our future.
I don't know you, and I don't know how long you've been in, so please don't take this as patronizing: I've seen a lot of young guys in the squadron the last few years that, because they commissioned midway through the Obama years, believe all the incompetence and all the PC bullshit in the Air Force stems from the Obama administration and Obama appointees. Not true. I came in when Rumsfeld was SecDef and "Buzz" Moseley was CSAF. Guess when Masters degrees came back, CSSs went away, Finance got centralized at Ellsworth, and E-9s were already rampaging? The latter part of the Bush years. It was probably happening earlier. Hell, it was probably happening from the days of He Who Shall Not Be Named on. In my adult life I've cast my four presidential votes for Bush 43, McCain, Romney, and, well, not the new guy. By far the lowest my morale has ever been in my career was the first 6 months of it when Rumsfeld was SecDef and the professional military advice of the generals—that our strategy in Iraq was clearly not working—was considered seditious.
I say all of that to say, (a) PC bullshit/E-9s gone wild is an AF cultural problem we brought on ourselves, not one imposed by the political branches of government (**caveat that holy shit Debbie James encouraged it, thank God she's gone**, and (b) with the political people, it's not Republican vs. Democrat you have to worry about, it's "People who understand and respect the professional culture and political independence of the military" vs. "Those who don't." Among the former in my time we've had Gates (Republican... although holy shit he hated the Air Force... who pissed in his Cheerios during his two years as an Lt at Whiteman in the 60s?), Panetta, and Ash Carter; among the latter we've had Rumsfeld and Obama/Biden themselves, all of whom treated the generals and admirals as a suspect Fifth Column loyal to their partisan opponents, who would try to steamroll the president's agenda by... offering their professional military advice, and who had to be beaten in the bureaucratic war.
So I am one the one hand buoyed by everything about Mattis, and most recently the letter you alluded to. On the other hand, I am deeply concerned by the new POTUS's CIA HQ visit, because it suggests the president falls into the latter camp, viewing us in partisan rather than professional terms.
I'm not saying that partisan differences on military issues don't matter; clearly they do. I like 3% pay raises better than 1.69% pay raises. But I care more that we avoid situations such as '02-'03 when the Chief of Staff of the Army got canned for questioning the wisdom of invading Iraq with >50% fewer people than the OPLAN called for, or 2009-10 when the office of the Vice President leaked like crazy to the press to attack Gen McChrystal for essentially saying "These are the forces required to achieve the objectives the White House set in its own Spring '09 Afghan policy review."
What we've seen so far does not have me optimistic at all. It has me very worried. But I do see Mattis and the esteem the public has for him as a potential BS filter, and for that I am grateful.