June 19, 2019 Misawa Block-50 F-16 hits 10K hours, an AF first One of Misawa Air Base’s most famous flight line assets hit a historic milestone June 10 as a 29-year-old Block-50 F-16 Fighting Falcon, tail number 808 affectionately known as “BOB,” reached 10,000 flight hours during a sortie flown across Japan.