How much they validate the information is a good question for the technical authorities. Their focus is really looking at the résumés and seeing if the years of work and types of experience are related to what's being requested. I'm not sure what other levels of investigation and verification they do across departments of whether they actually attended the university that's on the résumé.
What I can say is that through the procurement process and within contracts, in terms of the representations and warranties on the part of the prime contractors, it's for them to attest to the validity of the information in those résumés.