RSBM
And, don't forget, even though it was three years prior to 1976 there was a pretty large fire in the records center in July 1973. And though Steven's records likely were not directly effected by this, there
could have been an impact to records (mis-filed, shuffled around, etc.) stored there after the fire.
The National Personnel Records Center (NPRC) Fire: A Study in Disaster Overview: On July 12, 1973, a disastrous fire at the National Personnel Records Center (NPRC) destroyed approximately 16-18 million Official Military Personnel Files (OMPF).
www.archives.gov
I was only 5 at the time of this fire but, I know about it because my Grandfather's records (US Army Air Corps Glider Pilot in WWII) were lost in this fire. He passed away when my Mother was only 16 and almost never spoke about his time in the war. All we know is that he flew missions during Operation Market Garden and, possibly, D-Day.