SOF is a German modern military RPG written by Volker Lohn. SOF may be interpreted as Special Operations Forces or Soldiers of Fortune, which are the two different campaign styles the game was designed for: special operations or mercenary operations in the era from ca. 1980 onward.
Character creation starts with randomly determining the attribute values. After that, a military or law enforcement career in one of the available starting organisations (police, secret service, army, navy, etc.) is selected. The player character can absolve six terms in the organisations, but first he has to pass a test (with die rolls) to be admitted to the organisation. If the test does not succeed, the career term is lost. During the career, the character can switch organisations or try to gain a promotion to one of the advanced units like anti terror or special operations units. During his career, a character gains certain skills depending on organisation and the number of terms served there. The starting money is also determined in the same way, and during the career the character can rise in the military ranks.
The basic task resolution mechanic is rolling a number of d10 determined by the skill or attribute value against a target number. If at least one die shows a result equal or higher than the target number, the attempted action was successful. Dice can also explode on a roll of 10, making higher results possible.
The combat rules employ an action point system. Every character has a number of action points he can spend during a combat round. This number is modified by encumbrance. The damage system is derived from the Shadowrun rules with a weapon causing one of four damage levels (light, medium, severe, lethal). This damage level is raised with the number of of successes scored on the attack role and reduced by the number of successes of a defense role (if possible). Rules are given for all kinds of weaponry, rules for damaging objects, vehicles, etc.