It's interesting -- on multiple occasions in that article, they shift seamlessly between two very different questions as if they are the same question. It is sometimes phrased as:
"Is the U.S. Military tactically proficient, but strategically deficient", but sometimes as:
"Is the United States tactically proficient, but strategically deficient."
But those are two very different questions. I would argue that the strategic problem is not on the military side, but on the geo-political side. It is our country has a whole that has lacked a logically consistent strategic vision, and the military has suffered from this lack of clear direction/authority/support. The best example of this is the War in Afghanistan. That war has suffered from a lack of sufficient force commitment, lack of clear civilian strategy, and then of course Obama's announcement of a withdrawal in two years, etc.. Those are all strategic blunders by civilian leadership.