A total of 20 US-1 and US-1A rescue amphibians were gradually delivered to the JMSDF over some 30 years from 1975 to 2005; just two (9089 & 9090) remain in service. This example is one of two preserved and was delivered as a US-1 in 1981 and following conversion to US-1A standard in 1986, continued in service until 11.93