Splash Damage announces the promised open beta testing is now underway for Dirty Bomb on Steam, offering a new Open for Business trailer from the free-to-play shooter. Here's the rundown on what to expect:

Players in Dirty Bomb’s Open Beta will initially find 12 Mercs to fill out their squad. Two Mercs – Combat Medic Aura and Fire-Support Specialist Skyhammer – are always available free to players, and there will be a variation of additional Mercs free on an ongoing basis. To kick off the Open beta, the following Mercs will be in free rotation beginning Wednesday, June 3:

• Kira, a powerful tactical character who can rain down hell from above with her Orbital Laser Strike, perfect for clearing out defenses and campers
• Sawbonez, a frontline support medic equipped with a Submachine Gun and Defibrillator Paddles, who is highly effective at reviving his teammates to full health
• Fragger, an aggressive pointman and straight-up player-slayer, with a big gun, lots of ammo, and devastating Frag grenades

Players also have the option of purchasing Mercs for their squad, including long-range sniper Vassili and the Minigun-toting walking tank, Rhino.

The Open Beta launches with five maps and two modes for players to put to the test. New content will continuously be added to Dirty Bomb in the coming months, whether in finished form, or prototype content for the community to try out and provide feedback on.