He had that picture taken and then posted it to his Twitter account. He wanted his fans to see it.
Reminds us of a funny 1966 movie, "The Russians Are Coming The Russians Are Coming." Its plot involved a Russian submarine captain who's fascinated with America, and when he moves too close to Gloucester Island off the Massachusetts coast, his sub becomes grounded. Nine of his men go ashore looking for a boat they might use to free the sub. Some residents of the island believe an invasion is underway and panic, among them Jonathan Winters. All things being equal, Jonathan Winters showed less self-conscious, ridiculous machismo.
These guys are their own self-parody.