One incident:

In September 2004, the manned weather station at the summit was closed after 72 years in operation. Observers monitored radar sweeps that detected typhoons and heavy rains. The station, which was the highest in Japan at 3,780 metres (12,400 ft), was replaced by a fully-automated meteorological system.^[25] As of 2006, the Japan Self-Defense Forces and the United States Marine Corps continue to operate military bases near Mount Fuji.