You can only put swarmers on the Obelisk or Advanced Obelisk. Wouldn't characterize them as a Fed hangar pet.
BTW... moving this thread to the Fed gameplay forum.
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Those that can acquire them, can get Jem'hadar Fighters as well, as they can go onto 'any' Fed hanger equipped ship, not just the Jemmy ships alone. My Gal-X is using elite ones, right now. They help blow things up good.