Because the Coast Guard is so unimportant.
“We have about 41,000 active duty service members of the United States Coast Guard — they are running vital missions right now madam president in the South China Sea, they are protecting our air space and ports along 12,000 miles of coastline, they are performing search and rescue missions,” explained Senator Kennedy.
https://www.oann.com/sen-schumer-blocks-gop-bill-to-pay-members-of-the-coast-guard/