According to the 4-field approach to anthropology, a people can be defined by its archaeology, culture, biology and linguistics (Hicks, 2013). Native Americans and Marines have striking similarities as a people when using this approach, especially in cultural and linguistic analysis.
"Marine Corps Cultural Similarities to Native Americans,"
Spectrum: Vol. 7
, Article 3.
Available at: https://scholars.unh.edu/spectrum/vol7/iss1/3