 As each Phantom passed, cockpits opened, the pilots indicated with upheld fingers the numbers of kills they'd scored.Of the 16 MiG-21s known to be in the VPAF inventory, 11 to 14 had been engaged on that day (depending on the source), with seven destroyed and two others probably shot down (by Combies and Maj. Herman L. Knapp, Rambler 03).Years later, Vietnamese government sources admitted that Operation Bolo on January 2 was one of the worst days for the VPAF during the war.