Your choice of screen name...wow...
I'd say Jewish people are one of the smallest minorities in the AF. Not saying that as a good or bad thing, just statement of fact.
At my field training I only saw one name under the Synagogue/Jewish Prayer, and she was a CTA. I decided to never go to any religious services at FT. But, at my old Det there are two other's Jews (which I was actually amazed at, but most of us are from Chicago so proportionately I think it was rather accurate).
I have seen Yamakah's (sp?) worn under the blue's service cap and nobody would ever know if you were sporting one under BDU cover anyway.
As for Kosher...how closely do you follow Kosher? Just no dairy and meat or also a Rabbi blessing the utensils and preparing the food? Because while it is relatively easy to separate dairy and meat I don't think you will be able to get a Rabbi in at Field Training to prepare the food (my experience).