Her Majesty's Select Commandos were of under the command of General Livette to help protect the Jedi base on Shedu Maad. Livette then gave command of them to Taryn Zel to repel the Imperial Remnant's stormtroopers led by Tahiri Veila.
The Commandos wore a special self-camouflaging armor that allowed the wearer to turn invisible. Trista and Taryn Zel also wore this armor, allowing them to sneak by the perimeter guards. Trista's armor was of a major and Taryn wore one with a officer's insignia.