Standard DL/3 class X-hazard chemical survival suit
From Tardis Wiki, the free Doctor Who reference
A team of fifty UNIT personnel including officers and soldiers were equipped with Standard DL/3 class X-hazard chemical survival suits to protect them from the chemical pollution on the Russian Steppes sometime in around 2004. However, thirteen soldiers died during operational manoeuvres while protecting the local population. (PROSE: UNIT's Position on the Skaniska Incident)
