Commissioning brings new or rebuilt equipment into production: checking the installation, testing every input, output and safety function, running the machine up and handing it over with its documentation.
The field service technicians below list commissioning, or a closely related skill, on their profiles. Say in the mission brief what the equipment is, who built it and what state the installation is in, so they can plan the days.
Read more in How to hire a commissioning engineer, or see how on-site missions work.