The "catalog" is the document that defines all degree requirements for a given academic year, and it is subject to change from academic year to academic year. The degree requirements for a particular academic year are referred to as "a catalog" or a "catalog year". Unless you deliberately change your catalog year (which you can do), your catalog year is the academic year during which you first attended Fort Lewis College. That catalog year outlines the specific requirements that apply to you as you pursue your degree.
EXAMPLE: If your first semester at FLC was Fall 2017, Spring 2018, or Summer 2018, your catalog year is 2017-2018. As such, the 2017-2018 catalog defines the requirements for all majors, minors, concentrations, and certificates available to you. In other words, your catalog year is your map -- it tells you exactly what you need to do to finish your degree.
You can find your catalog year in your WebOPUS degree audit. It will be listed right under your declared majors/minors/certificates.