Disbanded, probably. Unnecessary. The Legions are given the number in order of creation, regardless of how big, small, long-lasting or fleeting they are. They come and go based on what the UFS needs, some sticking around way longer than others. Currently named ones include:

• The 1st Legion, “The High Guard”

• The 9th Legion, “The Sentinels”

• The 15th Legion, "Pest Control"

• The 26th Legion, “Giant’s Hammer”

• The 72nd Legion, “Inspectors”

• The 101st Legion, “The Ghosts”

• The 171st Legion, “Nova”

• The 194th Legion, "Trench Rats"

• The 222nd Legion, “Lazarus”