H1-B visas for skilled workers might serve as a model: they can run for two three-year periods, giving both workers and employers time to decide whether they would prefer a permanent arrangement.

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For example, it is not clear whether the U.S. military would want a permanent basing arrangement or more flexible intermittent access.

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That is difficult to do in a traditional permanent work arrangement.

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At the very bottom, you'll find a familiar arrangement of permanent shortcuts to the phone, email, messaging and camera apps.

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