From
this article: McCain has cited her authority over the Alaska National Guard as one example [of her experience]. But in a memo last spring, Air Force Maj. Gen. Craig Campbell warned that "missions are at risk" in the state's units because of a personnel shortage. The lack of qualified airmen, Campbell said, "has reached a crisis level."
In an interview on Wednesday with The Associated Press, Campbell said the situation has improved since then, but not enough to eliminate his concern that shortages will result in "the burnout of troops."