Intrusion Detection Navy Petty Officer 2nd Class Ryan Allshouse uses the intrusion detection system to monitor unclassified network activity from the automated data processing workspace aboard the aircraft carrier USS Ronald Reagan off the coast of San Diego, March 10, 2009. SHARE IMAGE: Download Image: Full Size (1.94 MB) Photo By: Rick Naystatt, Navy VIRIN: 090310-D-ZZ999-009.JPG Photo Gallery