Home SDI System Dynamics International Huntsville AL Alabama Woman Owned Small Business WOSB Aviation Aircraft Unmanned Missile Systems Research Development Engineering R&D defense contractor weapons military Army command test analysis Apache Longbow Helicopter UAV MAV UAS U.S. Army Aviation and Missile Command Trainers C4I Algorithm software SDI - System Dynamics International. A Woman Owned Small Business (WOSB). SDI is a high technology engineering services firm with a focus on aviation, missile, and UAV/UAS systems and operations.