Captain Sebastian 'Mac' Machnicki is a veteran operative for Blackforce Corporation. A former member of the famed Polish GROM, Mac joined Blackforce in 2004 after a successful tour of duty in Iraq during Operation Iraqi Freedom in 2003.

While a little younger than that of Steven 'Ghost' Edwards or John 'Cobra' Davidson, Mac has proven himself under fire quite a few times and has learned a lot from the more seasoned and veteran operatives from his enlistment to 2010, when he was given command of Task Force: Nova.