[Suicide Junkie]

Example: You attack an enemy fleet with your fleet.
One enemy ship turns out to be a minelayer, and spews mines into space as it runs away. You and the other fleet square off and fight it out.
You win, and combat ends. Now, you are in the same square as an undetonated minefield.
Using the Sweep command allows you to sweep the mines without moving one square away, then coming back to sweep the mines.