If you were stationed at RTC Great Lakes in the late 60's you would have done most of your instruction via video link or prerecorded programs. This painting of USS Hooper appeared behind the instructors. I went through Great Lakes in July 1969 and the painting was still there in 1975 when I took this photo during a two week Reserve Duty assignment.
I have this photo listed at NavSource Online:
Destroyer Escort Photo Archive.
USS Hooper DE-1026.