A few organizations within the army maintain authorizations for a chief warrant officer to serve as an XO/2IC. One example of this is the Modular Ammunition Platoon, where the ammunition technician acts as the second-in-command during the absence of the platoon leader. While the experience gained as an XO is highly beneficial for an army officer's professional development, it is not necessarily a prerequisite for a command position. At the army level of command, a commanding general will have a deputy commanding general as second in command and an "executive officer" on his personal staff who works as his liaison to the general staff and an aide-de-camp who takes care of his calendar and personal needs.