![File:US Navy 081023-N-4047W-039 Personnel Specialist 1st Class Berrie Lyons adjusts Personnel Specialist Seaman Magen Gilliam's face mask during a general quarters drill.jpg - Wikimedia Commons File:US Navy 081023-N-4047W-039 Personnel Specialist 1st Class Berrie Lyons adjusts Personnel Specialist Seaman Magen Gilliam's face mask during a general quarters drill.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/f/fd/US_Navy_081023-N-4047W-039_Personnel_Specialist_1st_Class_Berrie_Lyons_adjusts_Personnel_Specialist_Seaman_Magen_Gilliam%27s_face_mask_during_a_general_quarters_drill.jpg)
File:US Navy 081023-N-4047W-039 Personnel Specialist 1st Class Berrie Lyons adjusts Personnel Specialist Seaman Magen Gilliam's face mask during a general quarters drill.jpg - Wikimedia Commons
![A soldier helps a student put on a gas mask during a drill simulating a chemical attack on a school in Lod near Tel Aviv March 15, 2007. REUTERS/Gil Cohen Magen (ISRAEL A soldier helps a student put on a gas mask during a drill simulating a chemical attack on a school in Lod near Tel Aviv March 15, 2007. REUTERS/Gil Cohen Magen (ISRAEL](https://c8.alamy.com/comp/2D1G2FA/a-soldier-helps-a-student-put-on-a-gas-mask-during-a-drill-simulating-a-chemical-attack-on-a-school-in-lod-near-tel-aviv-march-15-2007-reutersgil-cohen-magen-israel-2D1G2FA.jpg)
A soldier helps a student put on a gas mask during a drill simulating a chemical attack on a school in Lod near Tel Aviv March 15, 2007. REUTERS/Gil Cohen Magen (ISRAEL
![Students wear gas masks inside a shelter during a drill simulating a chemical attack on a school in Lod near Tel Aviv March 15, 2007. REUTERS/Gil Cohen Magen (ISRAEL Stock Photo - Alamy Students wear gas masks inside a shelter during a drill simulating a chemical attack on a school in Lod near Tel Aviv March 15, 2007. REUTERS/Gil Cohen Magen (ISRAEL Stock Photo - Alamy](https://c8.alamy.com/comp/2D21BT4/students-wear-gas-masks-inside-a-shelter-during-a-drill-simulating-a-chemical-attack-on-a-school-in-lod-near-tel-aviv-march-15-2007-reutersgil-cohen-magen-israel-2D21BT4.jpg)