On Oct. 16, Catherine Banks, a Marine Corps veteran, was asked to get off her flight, which was departing out of San Francisco International Airport. Once she exited the plane, the flight attendant explained that Banks needed to change because her shirt was “threatening,” Banks told NBC Bay Area (KNTV). It featured a message about veteran suicide rates in the U.S.

“Do not give in to the war within,” the shirt read. “End veteran suicide.”

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I said, ‘Are you kidding me? I’m a Marine Corps vet. I’m going to see my Marine sister. I’ve been in the Marine Corps for 22 years and worked for the Air Force for 15 years. I’m going to visit her,’” Banks said. “He said, ‘I don’t care about your service, and I don’t care about her service. The only way you’re going to get back on the plane is if you take it off right now.’”

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“Delta is seeking to make contact with the customer directly to hear more so we can begin to look into what occurred,” a spokesperson for the airline told SFGATE in an email.