\An awesome fansite about this history of classic hardcore NeoGeo run-n-gun series Metal Slug, there’s lots of information and screenshots scavenged from Japanese gaming magazines about its development!
All images in this post from Metal Slug M.I.A., which has many more of them!
You could rescue soldiers who would then help you in battle, such as the one in the white uniform in this image riding on the Slug.
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