"Means by which a strategy is carried out; planned and ad hoc activities meant to deal with the demands of the moment, and to move from one milestone to other in pursuit of the overall goal(s). In an organization, strategy is decided by the board of directors, and tactics by the department heads for implementation by the junior officers and employees."
In laymen terms, tactics is basically a series of calculated actions with the ultimate goal of achieving a certain end. This means that you are going to have to take risks and I assure you that everything that goes into small unit tactics is a calculated risk from the type of patrol formation to how you are going to clear a room.