What call sign should be used when referring to the Vice President’s aircraft?

The call sign used when referring to the Vice President’s aircraft is "Executive Two." This call sign is part of a naming convention used for aircraft associated with high-level government officials. Specifically, "Executive One" is utilized for the President's aircraft, while "Executive Two" designates the Vice President's aircraft. This system underscores the distinction in hierarchy and protocol between aircraft used by different officials.

The term "Army One" refers to military aircraft specifically used by the Army, while "Army Two" would not be applicable to the Vice President and is not an official designation used for any aircraft. "Two" by itself does not provide enough context to identify the aircraft or the official associated with it. Thus, "Executive Two" is the appropriate and correct call sign for the Vice President’s aircraft.