Unfortunately I couldn't find a decent trailer for the show as it ended early in Youtubes life, so he's one of the intros.
The basic rundown is that they are the USA's elite fighting team, a top secret Unit that most of the military doesn't even know exists. They are the Black OPs team that are sent into situations where regular special forces aren't good enough. The show follows the team as it's deployed out on missions, but what makes this show fantastic is that it also delves into the lives of their families. What life is like living on a base when your husband is deployed on Top Secret missions and the sisterhood they share. It did get a number of seasons, but it still felt too soon when the show was axed in 2009. It's one of those shows that I often go back to because the style and writing is so unique.