Which form is utilized to file a formal Equal Opportunity complaint?

The correct choice is DA Form 7279, which is specifically designated as the form to file a formal Equal Opportunity (EO) complaint in the Army. This form facilitates the documentation and processing of complaints regarding discrimination and harassment based on race, color, religion, gender, national origin, or sexual orientation. Utilizing this form ensures that the complaint is properly recorded and can be addressed through the appropriate channels within the Army's EO program.

The other forms mentioned serve different purposes. For example, DA Form 7260 is not related to the EO complaint process, while DA Form 7280 and DA Form 7290 also pertain to other administrative functions not associated with filing Equal Opportunity complaints. Each form is tailored for specific instances, so knowing the correct one to use is crucial for effectively addressing and resolving EO issues.