The OTV-2, also known as the X-37B, supports space experimentation, risk reduction, and concept of operations development for long duration and reusable space vehicle technologiesChange in Launch Atlas V OTV-2 is rescheduled for March 5.
The scrub was due to weather issues not mechanical so the hope is that the skies will be more cooperative tomorrow, March 5.
Here's the official statement from United Launch Alliance:
Cape Canaveral AFS, Florida. (Mar. 4, 2011) - The launch attempt of the United Launch Alliance Atlas V with the Air Force’s second Orbital Test Vehicle was scrubbed today for weather. Thick cumulus clouds, which could produce triggered lightning, were within 10 miles of Space Launch Complex-41 during the scheduled launch windows. This is a launch criteria violation.
The Atlas V vehicle and OTV-2 are safe and secure at this time. The launch is rescheduled for Saturday, March 5 at 4:09 p.m. EST. Stay tuned.
http://www.satnews.com/cgi-bin/story.cgi?number=1050256912