(V):

The use of performance enhancing substances in the military goes back a long time through history.

The Greeks talked of theis soldiers and athletes using small amounts of strychnine mixed with egg whites as a way to increase their strength.  Strychnine acts as a stimulant and increases the strength of muscular contractions.  That practice continued until the early 20th century when amphetamines were discovered by German chemists.

During WW II all sides of the war used amphetamines.  Reputedly British troops consumed 72 millions tablets during the war.  Both the RAF and the US Air Force gave amphetamines to their pilots during long missions.  German troops used amphetamines and testosterone to increase strength and aggression.  Amphetamine use has been blamed for many "friendly fire incidents" into our modern era.

Cocaine abuse has been a terrible thing too.  Cocaines has been very common in Africa among those people using child soldiers.  Rebels in Sierra Leone and Angola would give cocaine to children, then make those children use axes to chop off people's arms and legs.  Cocaine abuse has also been broadly implicated in the wars in Congo and the genocide in Rwanda.

Today special forces around the world use amphetamines, cocaine, and other stimulants to increase strength and alertness.  They also use steroids, growth hormone and IGF-1 to increase strength, and EPO to increase endurance.  This has led to some horrific things happening.  There was a case of a Russian soldier who had his legs and genitals amputated during a hazing ritual and drug abuse among the soldiers was  major cause of the tragedy.

I am a chemist and I despise the drug abuse.  I think our governments turn a blind eye to many forms of drug abuse because it is politically convenient and because government officials themselves are making money out of drug trafficking.