RYDR…short for Mr R1D3R because that is my name.lol
Mine in all halo games is NKIE for my gamertag/youtube name, Nikie
NBLE- Stands for Noble, obviously.
My GT has always had Noble as a tribute to Halo: Reach, the reason I bought an Xbox in the first place and the place where my most treasured memories of gaming took place.
J117.
I know a bit lame. But after how they treated Chief with Halo 5 I had to go with the GOATs name out of respect.
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MAGA - I, like God Emperor Future President Donald Trump, want to Make America Great Again, of course.
0025 lacrosse number.
I used to row in college and the fin on the back of the boat is called a SKEG, hence the service tag.
“MEOW”, i guess that’s the sound that tacos do?
Mine is WASP being an alias I gave my Spartan due to me having a Wasp in my emblem ever since Halo Reach 
Mine CAIN Is to make it easlier for.call outs. But use to be ck19 for my gamer tag CainKong19 that i took from people making fun of my for having lots of body hair. So i ran with it and stuck with it ever since
HAUS - Short for Funhaus, a YouTube channel
My Service Tags, prior to Halo 5, were either “B318” or “Rook.” B318 is the service number to my Spartan, who was a former member of Beta Company (S-III). Rook was used for a while in ODST and H4, which was to pay homage to the Rookie.
My current service tag, IQUS, is obviously the “surname” of my gamer tag and is based off of the name of Tres Iqus, a character from Trinity Blood. He’s a badass cyborg.
Mine’s XJ23, inspired by My Life as a Teenage Robot’s Jenny Wakeman (XJ9), and my favorite number (23)
CAPT. I wonder what that could mean. Hmm…
Dare because of Dare
Mine has changed over the years but it has been NOEL as on the last few Halo games. I got the name from Noel Vermillion (also who I main as) who is a character from BlazBlue (which is a 2d fighting game). Nothing special but not to be confused with Santa.
Mine is currently PTSX because my running joke is that I’m pretty meh at shooters and can never rise about a 0.60 (“point-six”) KDA (go ahead and look at my CoD stats, they all hover around that mark). I’m above that in H5 but the tag remains!
reqs sigh halo 5
JAKE bc thats my name
“Jeff”
My name jeff
-Promethium