This is why sodium is saved in kerosene to ensure that it does not come in contact with moisture or oxygen. The Mars Folks are aliens which might be in the plot to take over Earth within the Metal Slug universe. They resemble squids, making use of their tentacles like https://judohistory48258.shotblogs.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-metal-gear-rising-45786016