Which of the following is NOT considered a category of discrimination?

The correct answer identifies a category that is not conventionally recognized in the traditional contexts of discrimination discussed in military equal opportunity policies. While the other options—gender, color, and national origin—are explicitly covered in various anti-discrimination laws and organizational guidelines, including the Army's own equal opportunity standards, the classification of "disability" often occupies a different space in legal discussions.

Disability is typically addressed under the Americans with Disabilities Act (ADA) and similar legislation, highlighting protections specific to individuals with disabilities rather than categorizing them alongside more commonly recognized forms of discrimination like race, gender, or national origin. Therefore, while disability is undoubtedly associated with discriminatory practices, the phrasing of the question, asking for a "category of discrimination," indicates that disability may not fit into the same framework as the other options listed.

In military contexts, there are specific provisions for accommodating individuals with disabilities, which further distinguishes it from the more broadly recognized categories of discrimination that play a pivotal role in equal opportunity training and policies.