What rank does an O-2 officer primarily function as in the military?

The rank of O-2 in the military is identified as a First Lieutenant in the Army, Marine Corps, and Air Force, while in the Navy and Coast Guard, it corresponds to a Lieutenant Junior Grade. The rank of O-2 primarily functions in leadership roles, supporting higher-ranking officers and managing junior enlisted personnel.

The designation "Lieutenant Junior Grade" specifically applies to the Navy and Coast Guard, where it serves as the immediate progression from an O-1 rank, which is Ensign. This rank typically involves responsibilities like overseeing divisions, conducting training, and participating in mission planning, making it integral to the chain of command and operational effectiveness.

In context, this understanding clarifies that while the other ranks mentioned play crucial roles in military operations, the designation of O-2 specifically aligns with the functions and responsibilities associated with a Lieutenant Junior Grade in the Navy and Coast Guard.