Japan’s government is calling for stricter oversight of U.S. troops stationed in the country after a soldier was charged over the alleged sexual assault of a Japanese teenager in Okinawa. Prosecutors in the southern island region charged the U.S. soldier in March, top government spokesman Yoshimasa Hayashi told reporters on Tuesday.

Local media said the 25-year-old man had been accused of assault, adding that he knew the girl was under 16, the age of consent in Japan.