The Low-cost Uncrewed (Unmanned) Combat Attack System (LUCAS) is a one-way attack drone developed for the United States Armed Forces by U.S. defense . It utilizes technology developed from the reverse engineering of the Iranian-designed Shahed 136. LUCAS is similar in appearance to the Shahed 136, albeit slightly smaller at about 10 feet long and with a wingspan of about eight feet. LUCAS is designed to be mass-producible at scale for low cost compared to more expensive conventional munitions.