Soldiers assigned to the “The Old Guard,” perform their duties at the Tomb of the Unknown Soldier in Arlington National Cemetery, Va. on a snowy Martin Luther King Jr Day. (Photo By: Army Sgt. Ethan Scofield) The cold wave that is presently gripping parts of the nation is bringing about discomfort, misery, havoc — even death. There are some professions whose members must perform their duties no matter what the weather may throw at them. “Neither snow nor rain nor heat, nor gloom of night stays these couriers from the swift completion of their appointed rounds” is an informal motto long associa…