Frankly, being ready in three years is pushing it. As you ably point out, building a military force from the ground up is one of the most difficult things to do. It's not like training burger flippers at McD's. It's a very long term project and in the meantime they are trying to fight an active, cunning and ruthless enemy at the same time. This is a tough job.
Naturally, the impatient MSM and the other Liberals think you can build anything in the time it takes to "visualize" it, much like the fantasy in a TV show. That is because most of them have never dealt with anything but words, concepts and theory and have never try to actually produce something. They are still of the opinion socialism "works" so you can see how off base they are in their thinking to start with!
One of the things that bugs me about this is, I've heard this "training" complaint numerous times over the last year on shows where ex-military were part of the interview, and not once, except last night on O'Reilly, have any of them spoken up to debunk this growing urban myth.
These guys are brought onto these shows as "military experts" and they let bad facts, one after another, fly right by them without correction.