They had to go fight stuff
An ancient Greek foot soldier was called a hoplite.
because it is
A hoplite was a citizen-soldier of the Ancient Greek city-states.
This is direct responsibility. It is the job of all soldiers to be careful and do prudent actions in order to keep others safe.
It must be a word (adjective) that starts with a letter in responsibility and describes responsibility.
Discribe any one famous soldier/officer?
because he is a common soldier
A soldier (especially a British soldier) is expected to keep to the Geneva Convection.
Archimedes
soldier, masculine
six sigma principles apply to manufacturing
If you ask about the equivalent 8-letter word for soldier in greek, this is φαντάρος (fandaros). There is also another one with more letters and it is στρατιώτης (strateeotees).