The Cahill Army is the military task force set up by Cahill One in August of 2016. It is led by the Cahill Council of Three. The goal of the task force is to defeat the Vespers once and for all. The Cahill Council of Three are also the Cahill leaders.

There are four ranks:

The Cahill Council of Three: Three members who lead the Cahills and the Cahill Army. These change every six years on the night of the full moon.

The Cahill Generals: Five members of the Cahill Family, one from each branch. These are the second in command.

The Branch Council: These are members of their own branch who lead them. They nominate General candidates when a general is killed.

The Cahill Agents: Everybody else, who can be promoted at any time, and also demoted at any time.