Tony mentions that the body in Arlington isn't really Cap's, but a decoy to please the public, and that this funeral would have been what Steve really wanted. The real body is here, and it will rest in the Arctic forever, the rationale being that he was preserved in peace here for decades until he could be revived, and so it was the best place for him to rest forever.
Tony notes that the body in Arlington isn't truly Cap's, but a fake to satisfy the public, and that this funeral would have been what Steve genuinely desired. The real body is here, and it will rest in the Arctic forever; the rationale being that he was preserved in peace for years until he could be revived, making this the ideal place for him to rest eternally.