While many Archers are free-roaming individualists communing with nature and not above hugging the occasional tree, some of the more populous races put those talents to work in a more disciplined, rigid, military capacity. Soldiers lose out on some of the Archer's wilderness survival skills, being mostly trained to defend castles and other developed areas, but gain some unique new ones in return. Their discipline makes them skilled leaders, an they can even impart some of their skills to other group-mates. Many races
train their soldiers with crossbows instead of bows. Like all Prestige Classes, they retain the original class's Prime Requisite, in this case, Dexterity.
Soldiers are far too law-abiding to ever become Assassins, but occasionally, that fervor for law leads them to trade their crossbows for great swords and become Paladins, albeit at a higher level than Warriors.