Private practice is a term used to describe the activities of military personnel. DRILL is a form of physical exercise that is used to train and condition soldiers for COMBAT. COMBAT is a type of warfare that involves direct physical confrontation between two or more opposing forces. SECRECY is the practice of keeping information confidential. Wargame is a simulated battle used to train military personnel in tactics and strategy. ENLISTMENT is the process of joining the military. Basic training is the initial period of instruction given to new recruits.