The length of time it takes to train a soldier depends on his duties and responsibilities. The more technical or the greater responsibilities the Soldier faces, they require a greater amount of training. Years are invested in the professional development of soldiers to ensure their discipline and competence in war. Once the soldiers are lost, it would take years to replace them. Because of the time it takes to properly train an army, nations must be careful how they employ it. If a nation suffers significant losses, it is susceptible to attacks from other nations during the time it takes to rebuild them