Raytheon Technologies Corporation is an American multinational conglomerate headquartered in Waltham, Massachusetts. The company is one of the largest aerospace and defense manufacturers in the world by revenue and market capitalization. It researches, develops, and manufactures advanced technology products in the aerospace and defense industry, including aircraft engines, avionics, aerostructures, cybersecurity, missiles, air defense systems, and drones. The company is also a large military contractor, getting a significant portion of its revenue from the U.S. government.