And in the distant future, when humanity has mastered many worlds, the most demanded profession is the craft of a soldier. Coming from a Russian-speaking planet, Sergei Petrovsky experienced all the delights of army life in his own skin. In a short time, he went through a difficult path from a soft-bodied naive student to a fired veteran of star infantry. In deadly battles, he was helped to stay alive by a "guardian angel" - a mobile infantry fire support complex named Three Hundred and Twentieth...