that would depend on his rank or just 'sir'. Nothing in the question implies addressing or TALKING about an officer nor WHAT army is involved...........
It also depends on whether you are addressing him, or talking about him.
In the British army, officers are addressed as Sir, but referred to as Ruperts.
quartermaster
quartermaster
The Commanding Officer .
centavase
You would probably be referring to the Army Chief of Staff.
John C. Fremont
Officer in the Army. has written: 'Killarny. A poem. By an officer in the army'
A high ranking army officer would have an enlisted aide to help them focus on their duties and not on things like cleaning, cooking, and pressing uniforms.
Field Marshal Sham Maneksaw
An army helicopter pilot is commonly referred to as a "helicopter pilot" or simply a "pilot." In military contexts, they may also be called a "warrant officer" or "officer" depending on their rank and role. Additionally, specific titles can vary based on the type of helicopter and mission, such as "flight officer" or "aviator."
who was the us officer that rejoined the union army
Allan Wilson - army officer - was born in 1856.