Earth Federation Space Force

The Earth Federal Space Force (or EFSF for short) is the branch of the Earth Federal Forces that the Earth Federation created to enforce the edicts of the Earth Federation Government in space. Prior to UC 0083 this branch was also refered to as U.N.T. Spacy, a sort of nickname for the entire operation. The Earth Federal Space Force was created to counter the percived military threat from the then Republic of Zeon, which had broken away from the Federation when it declared independence. This branch of the armed service is almost exclusively concerned with space combat, and before the One Year War this branch was listed under the other three branches (Earth Federal Army, Earth Federal Navy, Earth Federal Air Force) and was commanded by generals appointed by those three. For example, General Revil was a Lieutenant General or Chujo of the EF Army.

When it was original created the Federation's Space Force was a mirror image of the "Big Gun" ship philosophy, embodying powerful guns to destroy its enemies. This began to change in UC0079, when the Zeon introduced their mobile suits, which thoroughly decimated the Federation's Space Force. The advent of the mobile suit forced the Federation to develop their own mobile suits and ships that could carry them, resulting in the Pegasus-class MS carriers. After the Delaz Fleet successfully executed Operation Stardust, the Federation's Space Force finally abandoned the "Big Gun" ship concept completely and focused on making ships that were capable of carrying mobile suits.

A handful of the Earth Federal Space Force ships were designed to withstand atmospheric re-entry and to operate on Earth; these ships were from Pegasus, Argama and Nahel Argama classes.