In which case, odds are that some idiots in Langley will cook a Tonkin Gulf incident to justify the Americans propping up the Chinese lest Chiang falls.....and shit escalates in warfare.....There are probably so many Fredenhal's and devotees of McNair clogging the works that the answer to your first question is "Probably not until well after the US advisors have sustained casaulty rates rivaling the OTL 8th air force.