Soldiers from the 82nd Airborne Division patrol in protective masks during Operation Desert Shield in Iraq. Getty Images
Senior Airman Antonio Gant dons mission-oriented protective posture (MOPP) gear during training at Yokota Air Base, Japan. Photo: US Air Force
Soldiers of the US Army 23rd chemical battalion wear gas masks during a competition to test individual soldier skills at Camp Stanley in Uijeongbu, South Korea. Reuters
A Russian chemical and biological defence unit undergoes rescue training after a simulated attack at a military base outside Moscow, in 2002. Reuters
Russian soldiers at Serpukhov's military missile research institute in 2010. AFP
Polish special forces in a joint training exercise of simulated chemical attacks in Warsaw underground, Poland, in 2015. Reuters
Jordanian and US soldiers take part in an exercise to conduct a chemical attack drill in Zarqa, east of Amman, Jordan, in 2018. Reuters