* As a noun: Generally, you do not capitalize "reservist" when it's used as a noun.
* Example: "My father is a reservist in the Army."
* As part of a formal title: You would capitalize "Reservist" if it's part of a formal title like "Army Reservist" or "Naval Reservist."
* Example: "He was honored as a distinguished Army Reservist."
* As part of a specific unit name: You would capitalize "Reservist" if it's part of a specific unit name.
* Example: "The 101st Airborne Division (Reservist) was deployed to the region."
In short, check the context and use capitalization based on the specific use of the word.