Some are chairs but others are not.
For the First Vise President it states: "She shall oversee the Community Service/Social Action Committee. She shall oversee all committees that are not otherwise provided for (i.e. Ad-Hoc Committees."
For the Secretary it states: "She shall oversee the Technology Committee."
For the Recording Secretary it states: "She shall oversee and serve as the chair of the Public Relations Committee."
For the Parliamentarian it states: "She shall Chair all committees relative to the By-Laws. She shall oversee the Standard Operating Procedures Committee. She shall provide oversight to the Nominating Committee."
Those are samples of the type of language listed in the duties of elected officials.