Recently on CPAN , an historian claimed that the destruction of the 16 or so B17 C's based at Clark field was arguably worse than Pearl Harbor. He never mentioned the number of B17's or the type involved but he felt it was fair to say that this force represented an offensive threat that was misused and destroyed on the ground. The B17 model C was a training aircraft that , among other things , lacked self-sealing wing tanks. There were no 500 pound bombs available probably because the B17C was designed to carry 100 and 300 pound practice bombs. The 100 pounder was almost inevitably loaded with sand. This same historian implied that the FEAF (which he never mentioned by name) never reacted to the news of Pearl Harbor and somehow managed to blame MacArthur. The fact is that after fueling every operational B17 C available they were airborne in expectation of a Japanese air attack. The IJN air forces based on Formosa planned an early morning attack on Clark field but they were slowed by bad weather. When an attack on Clark field did not right away materialize , someone decided that it was a good idea to return to base and refuel. All at once. Some say that General Brereton intended to prepare for a late afternoon strike at airfields on Formosa. That is nonsense and would have been a complete folly. IJN and IJA air forces enjoyed a 10-1 numerical advantage over the FEAF with more experienced pilots flying superior aircraft.