The Aerospace Corporation is a nonprofit corporation that operates a federally funded research and development center (FFRDC) headquartered in El Segundo, California. The corporation provides technical guidance and advice on all aspects of space missions to military, civil, and commercial customers. Aerospace also designs and develops spacecraft, sensors, and other systems in support of national security, civil, and commercial customers. The corporation has more than 4,000 employees and operates a number of laboratories and test facilities across the United States.