This was published in an anthology I read in 1975. The anthology may have been fairly recent at that time (new or 2-3 years old).
Plot: The lone person is viewing a video of the person who was there before him, but died in battle. This person may have been something like the 10th person to be posted out there in the station. The video starts with the previous person saying "Hello, Brother" and then offering some other words of wisdom on being alone and responsible. The duty of the lone person is to respond and defend the outskirts of the claimed space. Of course an attack comes. The first thing the newbie does is remember protocol and notify command. He then proceeds to deploy defenses. Each side has many flying "units" that are deployed and used in the thrusts and parries of the battle. At the end he thinks he made a mistake and has lost, but the reinforcements arrive -- he had forgot that he had notified command.