JOINT BASE ANDREWS, Md. -- U.S. Army Special Forces soldiers are mobilized for a Fast Rope Infiltration/Exfiltration demonstration on a UH-60 Blackhawk Aircraft . This system was designed to provide special operations forces access to areas where helicopters are unable to land. The demonstration is part of the Joint Service Open House 2010 held here May 14-16. (U.S. Air Force photo by Senior Airman Melissa V. Brownstein)