The service rifle (also known as standard-issue rifle) of a given army or armed force is that which it issues as standard to its soldiers. In modern forces, this is typically a highly versatile and rugged assault rifle, battle rifle or carbine suitable for use in nearly all theatres and environments. Service rifles are also often selected for their upgradability (e.g., the addition of underslung grenade launchers, sights, flashlights, laser sights, etc.)
Although certain weapons issued to special forces units are rarely considered "service weapons" in the truest sense, certain specialist rifles and submachine guns are categorized as such if issued as per standing operating procedures upon entering special environments or scenarios. These may include urban warfare (FIBUA/MOUT) and jungle warfare environments.
Most armies also have service pistols/side arms.