If there is a FS Marriott near you may consider than since you'll get breakfast in the CL or if no CL a certificate for breakfast. When I was a gov't employee I do not recall CY providing a breakfast, but even my co-workers when staying at a FS Marriott would have breakfast included.
I use the government rate most of the time. With only a few exceptions, breakfast is almost never included at CY. I do have a booking at the CY in Killeen, TX that specifically states that breakfast for 1 guest is included. Several years ago it seemed more common, but now that CY has shifted to the Bistro format at most properties, having breakfast included has become a rarity. I was actually surprised to see it at Killeen when I made my reservation.
IAHFLYR is right. Find a full service Marriott if you can. Barring that, SHS, FFI, TPS, and ResInn all have breakfast for everyone.
I avoid Courtyards unless there's no other Marriott available. Recently, I was at a conference and booked a special offer weekend rate that included continental breakfast for 2 adults. You know what that breakfast was? One beverage item and one cold food item from the Bistro. Never, ever again.