Thanks, I did a bit more Google mining overnight. Today this badge is only worn by the Chief of General Staff, I checked photos of the Deputy Chief and they all still wear their corps badge.
Below is a quote from a site that sells IDF gear
http://www.israeli-forces.com/cgi-lo...t=show_product
In the early years of army establishment this symbol was being used all soldiers in all units, except for the air force, navy and artillery corps, all received the same symbol hat is a symbol of the IDF. The only difference was supposed to be just under the symbol background color to any force, but the idea implemented only partly.
Over the years, several of corps have been established and created their own berets symbols, this cap badge tag it later became chief of staff of the exclusive hat.
Steve