The default soldier is an outfit built primarily with cosmetics the player starts with. It uses the old default uniform (later replaced by the default camo outfit) with the default head, with the addition of a tactical vest found in the Person Crate 1 from missions. It was additionally possible to get through the legacy Gear Crate.
Since the Person Crate 1 only contains three cosmetics—two of which are already owned by default—players will complete the outfit as soon as they complete any of their first missions (which at least one is guaranteed to be completed within one round). This makes this the easiest outfit to complete in the game. Following this, A. Lotta Ribbonz is the easiest non–default-based outfit to obtain.