Okay, the number math in the military is always a little hazy...
The reason why they may have taken 14 instead of their 11 quota might be because they suddenly had a change in funding (this happens all the time, believe it or not) or some other reason. But in reality, it's only 3 more people than their quota for the whole Army, which in the scheme of things is not a lot of people.
The Army has projected out how many optometrists they'll need four years from now, based on how many are in the Army now, how many are in school, how many they expect to leave, how many they expect to apply, etc. If it's an undermanned specialty now, your chances of getting a deferment may be better.
I will say that the military is never good at projecting these numbers; when I was an undergrad, the Navy was 50% undermanned for nurses (so they were giving out nursing scholarships like it was a bread line) and by the time I graduated they were 200% overmanned. It's a lot like reading tarot cards.
-p.dot