Other schools are available to soldiers who want to rise in rank. These include NCOA (Noncommissioned Officer's Academy) and OCS (Officer Candidate School). NCOA has three levels: BLC (Basic Leadership Course: E4-E5), ALC (Advanced Leadership Course: E5-E6), and SLC (Senior Leadership Course: E7 and above). These courses are broken into four or five live-in phases at Camp San Luis Obispo. OCS is an intensive course meeting five times at Camp San Luis Obispo for live-in phases. In addition, officers have Officer Professional Development (OPD) courses. In every course, work is done on-site and during the interim.