Coherent Technical Services, Inc. (CTSi) is a company that provides technical solutions for the defense and commercial sectors. Its products include Expeditionary Lighting Kit (ELK), a battery-powered kit that provides supplementary cargo area lighting for mission operations; Desert Fauna, an acoustic detection system that automatically detects, identifies, and geo-locates animal and bird species vocalizations, etc. The company also offers rapid prototyping, aerial refueling, cybersecurity, integration, air traffic control, and other services.