A large number of U.S. Marines are choosing not to receive a vaccine for COVID-19, CNN reported.

About 40 percent of Marines who have been offered a shot, or 48,000, have so far declined a vaccine to protect against the coronavirus. Of the 123,500 Marines who have been offered a vaccine, about 75,500 agreed to get one, according to data obtained by CNN.

Over 100,000 Marines have yet to be offered a vaccine, the network said.

“We fully understand that widespread acceptance of the Covid-19 vaccine provides us with the best means to defeat the pandemic. The key to addressing the pandemic is building vaccine confidence,” Marine Corps spokesperson Col. Kelly Frushour said in a statement to CNN.