I take it that CW2 is US Army as USAF does not have use the warrant officers rank:
The USAF inherited warrant officer ranks from the Army at its inception in
1947, but their place in the Air Force structure was never made clear. The US Air Force stopped appointing warrant officers in
1959, the same year the first promotions were made to the new top enlisted grade,
Chief Master Sergeant. Most of the existing US Air Force warrant officers entered the commissioned officer ranks during the
1960s, but tiny numbers continued to exist for the next 21 years.
The last active duty Air Force warrant officer, CWO-4 James H. Long, retired in
1980 and the last Air Force Reserve warrant officer, CWO-4 Bob Barrow, retired in
1992. Since then, the Air Force warrant officer ranks, while still authorized by law, are not used.