A series of twelve novels by Simon Hawke, written from 1984 to 1991. The main characters live in the 27th century, but the greater part of each book takes place in the past. After the invention of Time Travel, the world has ended war in the present. International conflicts are resolved by sending soldiers into the past to fight in wars that have already happened, but the soldiers have to be careful not to cause a Temporal Paradox, which could have disastrous effects on the timestream. The main characters are members of the Time Commandos, a unit with the job of averting paradoxes by carrying out "adjustment" missions in the past.