The revised regulations state that federal contractors and subcontractors need to survey for veteran status and disability status at the pre-offer and post-offer stages. Thus, attempting to collect this data during an in-person interview isn't the appropriate time. Consider asking the information at the same time you survey for race and gender and on the first day the new hire appears for work but before the new hire begins performing his/her duties of the job.
You can use this OFCCP audit checklist to ensure you're doing what is required to maintain OFCCP's regulations including VEVRAA, Section 503, and EO 11246. Or request a demo to streamline your compliance and recruiting efforts.