. "Popular Mobilization Forces" . . . "(political support)" . . . . "2019-2021 Persian Gulf crisis" . . "United Kingdom" . "200 personnel" . . . "Oil facilities damaged" . "12,000 troops" . . . . . . "(political and military support)" . . . "2019\u201321 Persian Gulf crisis" . . "Iranian Border Guards" . . "1MQ-9 Reaperdrone downed" . . . . . "50,000 troops" . . "increased tensions" . . . . "1Black Hawkhelicopter destroyed" . "20pxCJTF\u2013OIR" . "2019\u201320 Persian Gulf crisis" . "Iranian Air Defense Force" . "2019\u20132021 Persian Gulf crisis#Timeline" . . . . . . "Kata'ib Hezbollah" . "1 destroyer" . "period of already strong tensions" . . . "3 civilian contractors killed" . "2 soldiers killed" . . . "Ongoing" . "People's Mujahedin of Iran" . "2019\u20132021 Persian Gulf crisis" . . . . . "1 sailor dead (non-combat)" . . . . ":2019\u20132021 Persian Gulf crisis" . . . . . "escalated tensions in the Persian Gulf" . "5 civilian contractors injured" . . . . . . "*Popular Mobilization Forces" . . "US-Iranian conflict" . "Iranian Air Force" . . "Crisis in the Persian Gulf" . "2 patrol planes" . . "Houthis(political and military support)" . . . . "1RQ-4A Global Hawksurveillance drone downed" . . . "Many of fighters" . . . . "(military support)" . "Iranian Navy" . "1 soldier killed" . "U.S.-Iranian tensions" . . . . . . . . . "Persian Gulf crisis (2019\u2013present)" . "117 soldiers injured (110 TBI)" . . . . . "Iran-backed militias" . "----" . . . . "Iranian Army" . "Iranian Police" . . . . "backed by Iran" . . "Persian Gulf crisis" . "heightened tensions with Iran" . . . . . "1 helicopter" . "Iranian Revolutionary Guard Corps" . "2019-05-05" . . . "2019\u20132021 Persian Gulf crisis" . "Elements ofIranian Armed forces" .