 On a daily basis, they have struck ISIS positions with HIMARS rockets, sometimes using as many as 30 rockets per day.The HIMARS systems used in this support operation are located in the Omar Oilfields, some 25 km north of the ISIS-controlled targets.Lockheed Martin UK and INSYS had jointly developed a demonstrator rocket artillery system similar to HIMARS for the British Army's 'Lightweight Mobile Artillery Weapon System/Rocket' (LIMAWS(R)) program.