Thanks Boonie. Sadly it's not on the microfilm holdings that contain the 173d's other operations for 1966, and 1ATF recorded minimal information on the US contribution to HARDIHOOD (understandable under the circumstances). My fear at this point is that an AAR doesn't actually exist, which would be extremely annoying - just had a flick through NARA and it appears to have most of the 173d's ops listed, but nothing for HARDIHOOD. Then again, NARA's Vietnam stuff is supposed to a rabbit warren so I guess there's still hope.
Colonel Summers' widely quoted critique of US strategy in the Vietnam War is having a modest vogue...it is poor history, poor strategy, and poor Clausewitz to boot - Robet Komer, Survival, 27:2, p. 94.