As with enlisted, we follow the US Army for officer's insignia, ignoring ranks we do not recognize. Our Chief Warrant Officer is equivalent to an Army CW2, our Senior Chief Warrant officer to the CW4. We do not have an equivalent to the CW3 or CW5.
For metal pin-on insignia, we prefer the "subdued" forms of insignia (black in place of silver and brown in place of bronze). Most vendors of insignia provide an option for normal or subdued colors.

The ranks recognized by the organization, in order of seniority.
Enlisted Personnel:
 
Officer Ranks:
 
A Warrant Officer is a non-commissioned officer, usually a specialist, which acts as both the highest non-commissioned rank and the lowest commissioned rank. They may exercise command authority as an officer when leading missions in their specialty or fill staff sergeant roles such as Command Sergeant Major.