As far as i know almost all Military personal Drink, that Quite common there; Rather i am not sure what is JD's trying to defend, is it that Mishra does not drink or that this is not his video of drinking.
As far as i think, it clear from his erratic & short fuse behavior that he enjoys his Drinks, i personally do not object to the mans Drinking nor think its a negative trait (until done in excess). What's concerning should be why did governing board of trustees make his selection (was it for pure optics or to clean their Image after the "chori" incident), i am sure he is a militarily capable man but that does not necessarily translate into managing a trust. To me it looks like its a cosmetic appointment.