The american volunteer group, that was discharged from the u.s. military and travelled on forged civilian documents to help defend China from Japan consisted of HUNDREDS of people. They did this in secret to avoid violating the neutrality pact preventing the U.S. from taking sides. I find it difficult to believes word of some several hundred american pilots abandoning the military and travelling in swarms to china was kept a secret. These were entire American fighter bomber squadrons flying U.S. planes into battle..... Japan didnt notice? Or they believed they were just volunteer civilians... *Edited by Otto to remove spammy links.