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The existing alternative is to fast rope off a helicopter. Jetpacks afford you the ability to land in multiple locations but guys in the air are going to be very vulnerable without the helicopter crew to cover them.

Other than being cheaper than a helicopter I don't see how this changes much if the defense is at least semi-competent.

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A helicopter being stationary enough for people to fast rope out of it is also vulnerable. I don't see why they couldn't still have the helicopter providing fire support while they approach with the jetpacks.

Also imagine a boarding like this occurring at night. Sure night vision goggles are ubiquitous at this point, but it is still going to be a smaller/stealthier approach compared to a helicopter.

Also boardings can be done safely in far more situations, much further out to sea. You can carry a few of these on pretty much any patrol boat, a helicopter needs a take off/landing site and has an operating distance.

Sometimes being smaller and more manoeuvrable is better than being better protected but larger and less manoeuvrable.

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