In case anyone is somehow unaware:
https://en.wikipedia.org/wiki/Totenkopf
In the early days of the Nazi Party, Julius Schreck, the leader of the Stabswache (Adolf Hitler's bodyguard unit), resurrected the use of the Totenkopf as the unit's insignia. This unit grew into the Schutzstaffel (SS), which continued to use the Totenkopf as insignia throughout its history. According to a writing by Reichsführer-SS Heinrich Himmler, the Totenkopf had the following meaning:
The Skull is the reminder that you shall always be willing to put your self at stake for the life of the whole community.[11]
SS-Totenkopfverbände ('Death's Head Units') was the Schutzstaffel (SS) organization responsible for administering the Nazi concentration camps and extermination camps for Nazi Germany, among similar duties. While the Totenkopf was the universal cap badge of the SS, the SS-TV also wore this insignia on the right collar tab to distinguish itself from other SS formations.
The... symbolic etymology, or however you'd say that, of this symbol... directly traces back to and explicitly references the Nazis, the SS.
Yeah, its been a thing in other LEO organizations in the US and Canads for a while now too.
LEO organizations run and staffed by Nazis.
EDIT:
In replying to a comment, I've made what is to me, an interesting discovery:
https://www.coinvaluechecker.com/rare-challenge-coins-worth-money/
The Battle of Ramadi was one of the bloodiest during the Iraq War in which the Iraqi forces, the U.S. and its allies fought against insurgents. During the eight-month battle, many lives were lost on both sides, including U.S. Navy SEAL Michael Monsoor.
Monsoor died following a grenade attack in which he was trying to save others’ lives. He was awarded the Medal of Honor posthumously for his acts of heroism.
Monsoor was part of SEAL Team 3 led by commander John Willink aka Jocko. A challenge coin was created commemorating the team’s exemplary efforts during such a bloody war.
That is apparently a challenge coin ... presumably, designed by Jocko Willink, or at least for or by him and the surviving members of his unit, to commemorate primarily Monsoor.
That's the first iteration that I am aware of, within the US Military, of a 'totenkopf', not with crossbones underneath, but with ... well, strictly, they are flames, but they do resemble a crown.
... as we see in the ICE medallion.
The US military generally tends to stay away from overt usage skull imagery, due to... the similarity to and association with the totenkopf... you can find a few exceptions, but they tend to be ... some kind of unit doing something ... covert, deniable, probably not strictly legal. Cough, MACV SOG, cough.
So, perhaps, more recently... the crowned skull variant as a symbol just actually derives from Jocko, or that this serves as some kind of evolutionary step, a missing link between 'totenkopf' and the evidently current 'crowned death'.
Jocko is a (former) Navy Seal, chummed it up with Dan Crenshaw, Tulsi Gabbard, Jordan Peterson, generally a big MAGA/Trump guy...
Yeah, I dunno, just ran into that, found it notable.