INSIDE THE FIRE
Now that you're familiar with the flamethrower system, let's see 
how good are you at tactics involved in using it. You're going 
to lead a squad armed solely with flamethrowers, so I hope you 
paid attention to the user's handbook...
 
 
SELF-DESTRUCTION
================
Any soldier carrying the flamethrower can choose to self-destruct 
the weapon, going out in a massive fireball (and hopefully taking 
a few of the enemy along for the ride).
 
To self-destruct, enter combat mode and then click and hold the 
mouse button over the skull icon appearing behind the Marine. 
Note that you need at least one shot's worth of fuel remaining 
in order to self-destruct. 
 
To prevent accidental self-destruction, the function does not 
activate immediately on clicking the action icon. Instead, a 
progress bar will fill up over several seconds as you hold the 
mouse button. Second thoughts? If you change your mind and want 
to abort the self-destruction procedure, simply let go of the 
mouse button before the bar fills completely.
.
