Depends on how one defines "first or second". Size? Quality? The USAF is huge
and trained to a very high quality. It has a different culture than the Israeli Air Force though. In that sense, we are more like the Indian Air Force in that we are more traditional spit and polish military. The Israelis just don't go in for that. In terms of quality, the Israeli Air force is equal or better than the USAF. They are more stringent in fighter pilot selection for example. They don't put up with any bureaucratic B.S. and they train constantly and realistically. I remember when they came to participate in an exercise in the USA and "fought" against the USAF and they were extremely impressive....just not very military looking. (Some wore New York Yankees T-shirts instead of their uniform tees and had long hair, etc.
). The Indian Air Force is highly trained and a force to be proud of, for sure. They have also visited the USA for joint war exercises and were impressive. The Indian Air Force is huge as well but not as uniformly equipped, with many older aircraft but well trained and very, very good.
The IAF visits America.