MSOCS,
You make a very good point re the tempo and stresses of the past 15 years vice the decades before. I know several that have left the SH community because they're just worn out, or the family is disintegrating due to stress/prolonged separation and, for some, the spectre of PTSD. My generation had a very different career to the Cold War generation. With the 'rest tours' and re-roles shrinking rapidly, and (however you spin it), a continual erosion of Ts & Cs and perks, then is it any surprise we find ourselves in another one of the cyclical retention troughs?