I have flown with both serving military,ex-military and wholly civilian pilots, and quite a cross-section of each. Those who have caused me the most grief and 'CRM' problems were those who always had/have something to prove (specifically, 'I'm better than you').
And not a single ex-mil among them. The ONLY crew I have met who have ever had an inflated opinion of their own abilities have been civilians, from various backgrounds. But maybe I've just been lucky.
Seems you get tw*ts in every bunch, eh Twisted?
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...proceeding below Decision Height with CAUTION...