Arfur,
Well said. I know absolutely nothing about this particular very sad incident, except what I have read here. Just another comment on the military side of display flying. Display pilots are current on type, selected, trained, supervised and monitored throughout their, normally one year, display season. It is almost a full-time job. That is not to say the mil system is completely infallible, there have been some notable incidents in the past, but it seems pretty tight just now.