WASHINGTON — The Pentagon has stepped back from the policy that requires all troops to get the flu shot every year by introducing exemptions for reservists and proclaiming that the shot is only necessary in some circumstances for all service members, according to a document obtained by The Associated Press.

The memo, written by Deputy Defense Secretary Steve Feinberg on May 29 and sent to all the military services, says reserve troops now will need to be on active duty for 30 days or more before being required to get an annual flu shot. It also says the military will no longer be paying for reservists or National Guard members to get the vaccine on their own time.

News of the policy change, which has not been publicly announced by the Pentagon, comes as the Trump administration and its a

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