The army doesn't do the Roman salute, but instead does something else to salute its leader. (Possibly something silly, if this is a Those Wacky Nazis context.)
The plot is set during World War II, but this trope still applies.
Downplayed: All armies are accounted for in a WWII story, but to avoid making anything too blatant they swap some characteristics of the armies on each side. No army, however, has any of the more extreme Nazi tendencies.
Zig Zagged: In one episode of the series, Nazis are shown with swastikas on their armbands. In another one episode, Nazis are shown without swastikas on their armbands.
Averted: All Nazis wear swastikas on their armbands, and all Nazi references (including Nazis, Adolf Hitler himself, all swastikas) are shown unedited.
Enforced: "This show shouldn't have swastikas because the swastika is a symbol for the Nazis!"
Lampshaded: "Hey, I thought that seal was originally a swastika in the manga.." "No. It's a manji, a Buddhist symbol of protection, and the producers changed it for the anime so people wouldn't accuse them of Putting on the Reich."
An artist with a penchant for Darker and Edgier works puts one into his painting, in a blatantly obvious way.
The author says "I don't care what people think, I'm going to put a manji in there".
Conversed: "Duh, what's with all those Nazis without swastikas all over this place?"
Deconstructed: The writers decide that even though it was a shameful point in history, they should not censor history, and were wrong to censor it.
Reconstructed: ...But don't want to expose kids in to this (see "Justified #2").
Played for Drama: A child meets with a group of seemly affable Neo-Nazis, and since he never learned about the atrocities of the original Nazis due to censorship, they have an extremely easy time convincing him to join their "little club".