In Israel, it is practically a requirement. In the US it's a mixed bag. Stereotyping hugely, I'd represent typical attitudes like so.

In the US, the denizens of the California startup scene (compared to the East Coast) generally have very poor awareness of matters military and lack the understanding to appreciate when/where/why/how military experience is a plus, outside of obvious things like military tech or DoD biz dev.

They have a certain schoolboy sci-fi-fan awe of badass-seeming military experience (special ops, fighter pilots, NSA, spy stuff, crypto...), but outside of that, I suspect, based on "shit silicon valley people say" type anecdotal evidence, they tend to view military people as somewhere between rednecks and stiff, pompous, bureaucrats, generally lacking the traits they admire (maverick defiance of authority, creativity, super-high intelligence...).

To be fair though, most of them are smart and very open-minded and I suspect they'd drop the stereotypes in favor of more accurate impressions and understanding of the potential advantages of specific military experiences, within minutes of meeting a specific person. They are great at quickly spotting talent and seeing potential once even a little data comes in. So I'd say, for an ex-military person to break into tech, just move to California and log the face-time hours. The military experience will turn into an advantage if there really is an advantage to be exploited.