Suppose this individual in 2009 (age  55) had a balance of 300 thousand (being generous to this army officer).

Then in 8 years his balance increased to  $990 thousand i.e. by $690,000  over 8 years.

Or roughly $86,000 contribution annually.

Or effective annual salary of more than $540,000  if contribution is 16% of income.

Add to that $3000 times the number of days out of the country = at least $600,000.

Total income annually probably more than one million.