Not until the 1950s. Before that it was up to the individual Southern states to see to needs of Confederate veterans.
The form for application for a grave marker is a War Department form 628. Dated 1939. I have a copy of the original form. Obviously a federal form, and before 1950's.
Anyway I'm not disputing that there was additional recognition in the 50's. But they were veterans whose families obviously received certain benefits long before that. The yankees were not that mean.