The Janus loop was a MACO training program in the 22nd century, which included extensive experience in an EV suit, as well as EV combat training.

Corporal Hawkins did six months in the Janus loop, a fact which led Lieutenant Malcolm Reed to select him for a mission to infiltrate a Delphic Expanse sphere in 2154. (ENT: "The Council")

It is unknown whether the Janus loop is related to the Saturnian moon Janus. Titan, a neighboring moon, was used for training exercises on numerous occasions.
In the pronunciation guide from the final draft script of "The Council", the word "Janus" was phonetically notated "JAY-nuss", though this does not match how the same word is pronounced on screen.