From the Manufacturer
Each team has several "player classes," that give each squad member a unique role. These include scout, infantry, sergeant, machine gunner, and more, each with a unique arsenal of historical weaponry at their disposal.
Day of Defeat includes an expansive collection of missions based on key historical battles. And a near infinite number of additional missions, created by the online development community, are available for download.
As war rages, squads must battle as a unit to achieve victory.