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Halo was influenced by the War on Terror in subtle ways - Polygon

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The Complete Evolution of Halo's Marines

What's your favourite marine design? : r/halo

Why The Halo TV Show Isn't Working - Game Informer

Favorite UNSC Marine design? Mine has to be halo 3 : r/halo

In Halo, are the marines really that incompetent in canons? - Quora

Halo 5: Guardians - Wikipedia

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What is your favorite marine design from Halo? - Quora

Comparison between every Marine design in all the main Halo games : r/halo

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Halo 3: ODST - Wikipedia