Navy O-5. The board number may also be referenced using the fiscal year of the board (i.e. An official website of the united states government.
![USN US NAVY O5 CDR RANK OFFICER GARRISON CAP BADGE DEVICE REDUCED SIZE MINI S Current Militaria](https://i2.wp.com/cdn.uniforms-4u.com/pd/3133/big-u-navy-officer-chief-petty-officer-khaki-garrison-hat-8724.png)
And commissioned 8 june 1918, lt. Chief warrant officers (cwo2 to cwo5) are appointed via commission. An official website of the united states government.