Looking at a number of recent accident reports makes me think that a number of  non-military pilots have a problem with understanding aircraft performance at high angles of bank and high g loadings.  We get the idea of how to avoid 1g stalls in the pattern fairly quickly but I see report after report of experienced pilots stalling out while pulling high g's low or trying to get to a runway after an engine failure by doing a very steep turn and not understanding what happens to sink rate if you do that.