Your ignorance of Marine history is astounding.
“The finest soldier any captain could wish to have,” said of Dan Daly by BGen W.P. Upshur
Marines have always been called soldiers, Soldiers of the sea and stuff like that. The dictionary says that the word Marine means soldiers affiliated with the Navy. This stuff about Marines are Marines, Not soldiers is a pretty new thing.
“Soldiers trained in the ways of the sea,” -CMC, BGen Benjamin H. Fuller
“He turned down the gold bars of a second lieutenant. ‘I’m a plain soldier,’ he said, ‘and I want to stay one.’”
-GySgt John Basilone
Just to quote a few Marines that have gone before.