Tens of thousands of members of the U.S. Coast Guard did not receive a paycheck on Tuesday, marking the first time in U.S. history service members in a branch of the U.S. Armed Forces were not paid due to a lapse in government funding.

The U.S. Coast Guard is the only branch of the U.S. Armed Forces affected by the partial government shutdown, as it falls under the purview of the Department of Homeland Security, rather than the Department of Defense like other branches.

Adm. Karl Schultz of the U.S. Coast Guard penned a letter to service members Tuesday, which marked day 25 of the partial shutdown of the federal government, notifying them that their paycheck would not be coming.

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“Today you will not be receiving your regularly scheduled mid-month paycheck. To the best of my knowledge, this marks the first time in our Nation’s history that service members in a U.S. Armed Force have not been paid during a lapse in government appropriations,” Schultz wrote. “Your senior leadership, including Secretary [Kirstjen] Nielsen, remains fully engaged and we will maintain a steady flow of communications to keep you updated on developments.”

The Department of Homeland Security, which has run out of funding, is at the center of the shutdown, as President Trump requested $5.7 billion for border security and funding for construction of a wall along the southern border.

The government has been partially shut down since Dec. 22, when it first ran out of funding. The president has vowed not to budge from his funding request for border and national security, and Democrats have vowed to block any spending package that includes funding for a border wall or barrier.

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The shutdown has left more than 800,000 federal workers and contractors without pay—with some being deemed essential to government operations, meaning they are expected to work without pay, like members of the Coast Guard; while others have been furloughed, meaning they are not expected to come to work. Those federal employees also are unpaid until the government reopens.

“I recognize the anxiety and uncertainty this situation places on you and your family, and we are working closely with the service organizations on your behalf,” Schultz wrote, saying that the Coast Guard Mutual Assistance (CGMA) has received $15 million from USAA “to support our people in need.”

Schultz also said that the American Red Cross would “assist in the distribution of these funds to our military and civilian workforce requiring assistance.”

Schultz acknowledged that other “dedicated civilians are already adjusting to a missed paycheck.”

“We are confronting this challenge together,” Schultz wrote. “The strength of our Service has, and always will be, our people. You have proven time and again the ability to rise above adversity.”

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He added: “Stay the course, stand the watch, and serve with pride. You are not, and will not, be forgotten.”