The value you are looking for is in the file descr_area_effects.xml. The number you want to change is <impulse_force>425.0</impulse_force>. This determines how they are knocked on their butts (,but this value does not effect how many soldiers die in the explosion, just how much they are thrown around).
I have tested a lower number (makes the men just lean away from the explosion) and a lot higher (4000 throws everyone in the blast radius into the air).
Hint- open the .xml file with a text editor (note pad)
Good luck, keep those questions coming.
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