Every military needs support crews. The Peacekeeper Techs, though generally not as well respected by their companions, are no less important to the efforts of the military.
They repair, build, maintain and generally operate Peacekeeper machinery in every facet of service. They are sometimes attached to commando units for special missions, such as technical scouting, surveys and salvage.
Peacekeeper Techs appear to be less fond of combat and weaponry than the regular Peacekeeper military. As is the case with all other wings of Peacekeeper soldiery, however, they do also seem to have some basic combat and defensive training.
The Tech's uniform is a simple green jumpsuit. It is probably designed to maximise comfort and practicality.