Quick and fun. Gas mask, action pose, big machine gun, body armor--these are a few of my favorite things to draw. I'm still that kid in 2nd grade drawing GI Joes on the bus with my buddy Neal!
I've been working on a fun project with lots of animation scenarios in it. So far I've come up with some things I think are very cool (that's often the elusive holy grail for illustrators), and while the schedule is rigorous, that just means there's not enough time to pick the images apart until there's not much of the original goodness left in them.
Here's a sketch of a SWAT officer/investigator. Hope he'll make it to the final stages. I actually think I'll go with the simpler version, so he's easier to animate quickly.