Active service refers to the period of time where one is actively engaged in military duties. Some synonyms for this term could be "combat duty," "frontline service," "war service," "military deployment," or "active duty." Each of these synonyms implies a period of time where an individual is actively serving and in potentially dangerous situations. In contrast, other military terms such as "reserve duty" or "inactive duty" imply a less intense level of involvement in military activities. Regardless of the term used, active service remains an important component of military life and is a testament to the sacrifice and dedication of those in uniform.