DC once thought it was a shootin' offense to not be putting out good war comics:
It is curious...war comics were once all the vogue, even into the mid-1980s. DC was obviously proud that they were still cranking out Sgt. Rock and the Haunted Tank et. al.
All that changed post-Crisis. And I shouldn't single out DC--Marvel hopped off the war comic bandwagon a lot earlier than the Distinguished Competition.
I'm sure part of it was that WWII was more and more remote, and more recent wars were more problematical from a "will they audience accept this war as moral and necessary" angle. War comics are easy when you can make Nazis the villain; not so easy when you've got to portray enemy troops of other races and cultures and not offend anyone.
I don't have any really brilliant thoughts or ideas here...I just found it interesting that 30-odd years ago, DC was proud of their war comics, and sold them fairly hard. Times change...
From DC Sampler #1 (1983), by these guys: