Is Krav Maga the same as Israeli Defense Force?
Krav Maga is a style of self defense whereas the Israeli Defense Force is the name for the Israeli military.
I trained briefly with a Wing Chun practitioner and it definitely wasn't for me. Have you seen the skit from In Living Colour where Jim Carrey is a Karate instructor and, each time a new student attacks him successfully, he blames them for having attacked him wrong? That was the vibe I got from it. But, to be fair, my exposure to it was very limited.
That having been said, all martial arts are great, it really just depends on what you hope to get out of them.
I studied Uechi Ryu Karate and Muai Thai for years, dabbled in Wing Chun, now I train in boxing, bjj, and submission wrestling.
If you want to learn how to actually fight, I'd recommend a good foundation in boxing, with some bjj and wrestling thrown in.
Found that skit on YouTube...http://www.youtube.com/watch?v=h_vvI26NnwE