DHS is making an effort to get standards developed for their projects to work at an optimal performance level. With standards in place, it will be simple to share information, failure rates will be minimal, and teaching employees how to operate just one system becomes less stressful.
That's just off the top of my head. I'm sure there are tons of other reasons for developing a standard. But anyways - DHS has become a member of The International Committee for Information Technology Standards.