Researchers Henrik Cronqvist and Stephan Siegel constructed a measure of savings by essentially tracking the changes in the net worth of the twins between 2003 and the end of 2007. They found that identical twins—who share the exact same genes—are significantly more similar in their savings behavior than fraternal twins. In fact, they conclude that genetic differences explained roughly 33% of the variations in individual savings rates.
Imagine a future in which such influences on behaviour, such biologically-mandated preferences, could be known about senior officers and top politicians before they they're empowered by command or office. It would be eerie in some way, but potentially world-changing for the better, too.
Citizens could almost know which politician would start a needless war because of some archaic territorial fight gene. An army could almost know in advance which officer would keep a cool head and find the right mix between caution and boldness.
Economics have begun to accept biology (neuroscience, for example) as a supporting science in the 90's as far as I know. Maybe political sciences and military theory should do the same, and embrace it fully to squeeze the maximum gain of insights out of it.