A drone attack on US troops killed three soldiers near the Jordan-Syria border on January 28, adding to the growing list of attacks on US troops by Iranian proxies. The attack has mounted pressure on the Biden administration to respond as Republican lawmakers call for “hard” strikes on Iran “now”. US Senator Lindsey Graham called on Biden to “strike targets of significance inside Iran.” If Biden decides to launch strikes deep inside Iran, US forces will face a myriad of air defence systems that Tehran possesses. Watch the video to find out more about Iranian air defence system.