Post #10 is spot on, despite "opinions" to the contrary. It's true that certain properties choose to restrict the GOV rate to certain entities and/or to official business. That is their right, but it's not the general rule. These properties state the limitations in their rate rules, and an alert front desk worker will refuse to check you in without proper papers. Unfortunately, many front desk workers are not particularly alert.

In my experience, most properties that offer a government rate do not provide any restrictions. I always check with Marriott to see whether I qualify before booking the GOV rate. I qualify most of the time, even when I'm traveling on non-state business. If the restrictions are unclear, I check with the specific property. The statements in my posts are based on this actual experience at scores of properties across the country.