Attack Force (2006)
'Humanity's greatest hope... Faces his greatest battle.'

This is the movie formerly known as Harvester. So clearly the plot outline on IMDB about aliens seducing man were way off, though I'm not sure the actual plot of this movie is any better. It involves Seagal leading his task force to their brutal deaths when they're all killed by some secret task force or something like that (terrorists?). Seagal, of course, survives unscathed. He then heads off to investigate them and finds that it's some rogue branch of the government and uh, I assume he kills everyone. Note the title follows the two word rule, and of course the plot is Seagal out for revenge since someone killed his task force. Perhaps since his task force isn't that close to him (let's face it, they're no wife or daughter), the poster has Seagal holding not one, but two guns. And just for posterity, there's an explosion behind him.