The last living American Volunteer Group Flying Tiger has passed away.

99-year-old Frank Losonsky passed away on Feb. 6, 2020. The Chennault Aviation & Military Museum shared the news on Friday.

Losonsky was a crew chief responsible for three to four aircraft at a time, the museum said in a news release, which continues below:

As the crew chief, he maintained the P-40s and would test the engines on aircraft prior to take off. He was honorably discharged from the AVG and returned home to Detroit, Michigan where he married. He then returned to China as a mechanic with Chinese National Aviation Corporation. Later, he returned home to build B-24 Liberators. After the Air Corps, he took a civil service job at Clark Field in the Philipines. Frank and his son would eventually write a book about his time with the American Volunteer Group called Flying Tiger: A Crew Chief’s Story.