Going by all dialogue instances throughout the entire games, including Easter eggs.
Some examples from some of the games are below in the links.
https://youtu.be/43ALsXCpY9Y
https://youtu.be/_Z4xEUrxvGo
https://youtu.be/CsMU74VgeGw
https://youtu.be/54ysvMW1pt0
https://youtu.be/xn_FfDvuSfg
https://youtu.be/eRPchTUhUkw
https://youtu.be/c6Di0-PBiqU
https://youtu.be/Q2ldNc2u7ys
https://youtu.be/BhMTUrBFm3o
https://youtu.be/O0ywS8J5A2E
https://youtu.be/l3I1IlRj9Ok
https://youtu.be/vYeZTgfFLjo
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"Men, we led those dumb bugs out to the middle of nowhere to keep 'em from gettin' their filthy claws on Earth. But, we stumbled onto somethin' they're so hot for, that they're scramblin' over each other to get it. Well, I don't care if it's God's own anti-son-of-a-bitch machine, or a giant hula hoop, we're not gonna let 'em have it! What we will let 'em have is a belly full of lead, and a pool of their own blood to drown in! Am I right, Marines?" -Johnson's speech on Legendary. Best, -blam!-ING, LINE, ever