There are legal minimums and there are insurance minimums. For legal minimums you need at least 500 hours to be able to fly "Part 135" charters, air ambulance, or pretty much in any other commercial operation besides flight instructing. Just about the only helicopter job you can get right out of flight school is teaching others to fly in the same type of helicopters.
In addition, the insurance companies pretty much dictate how much experience a pilot needs for a particular job in a particular type of helicopter. If you want to fly a turbine-powered helicopter, plan on paying for training in one, and not just a couple of hours. That's not cheap.
Want to fly a turbine helicopter for an air ambulance company or police department or TV station? Plan on getting more than 1,500 hours of experience and at least 500-1000 hours of turbine helicopter experience as well as a significant amount of night experience. That's what it takes to be competitive unless you know influential people in high places who are willing to pull some strings for you.
Where's the best place to get the experience needed for most helicopter jobs? Two ways. (1) a series of civilian jobs and a lot of patience while you gain experience allowing you to move to another job, then another, and then another, always moving up the ladder in order to qualify for your "dream job".
The other way is in the military where all your flying experience will be in high performance turbine equipment, day and night, in all weather conditions. In other words, it's a "hard row to hoe" for civilian-trained pilots to compete with that and it takes a long time and costs a lot of money to gain the required experience - just like getting qualified to fly for an airline. Insurance companies call the shots and ex-military pilots have a distinct advantage in experience.
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