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President Trump’s move to ban transgender people from the armed forces reverberated across California’s military communities on Wednesday.

In San Diego County, home to more than 100,000 active duty military personnel, transgender service members were struggling to understand what the policy change meant for them.

“Obviously this has rocked everyone,” said Kathie Moehlig, executive director of TransFamily Support Services, a transgender support group based in San Diego that has a number of active duty clients.

Mr. Trump said that the military could not be burdened with what he called “the tremendous medical costs” of allowing transgender service members.