One week Tesla and SpaceX founder Elon Musk’s waxing metaphysically and philosophically (in ways only he could) and the next he’s coy and cryptic, tongue firmly in cheek, tweeting replies to major news networks’ highly-publicized speculation about his whereabouts and interactions.

When CNN published an article questioning why he visited the Pentagon recently, he answered, but with few words, embedded in the following tweet:

If you didn’t catch the Iron Man/Tony Stark reference, well, there you go.

He was joking, of course (well, probably?) and the real reason was summed up nicely by The Verge’s James Vincent:

… there are plenty of non-Iron-Man-related reasons that Musk might be chatting with the folks at the Pentagon. Tech innovation is something the Department of Defense is keenly interested in, and in March this year, it even created a new advisory board to “tap innovation” from the private sector, headed by Alphabet chairman Eric Schmidt. The board wants to recruit 12 individuals “who have successfully led large private and public organizations, and excelled at identifying and adopting new technology concepts,” but as of now, the DoD doesn’t seem to have announced any new members. (We’ve tried to reach out to the DoD to ask about this, and will update the story if they respond.)

Musk, meanwhile, already has his own dealings with the US military. In April SpaceX won a contract with the US Air Force in a $87.2 million deal to launch a GPS satellite in May 2018, the first of its kind since the company was given approval to bid for this sort of work in May 2015. So while we may joke about Musk’s resemblance to Stark — they’re both described as genius billionaires with boundless enthusiasm and curiosity — the main point of comparison is a little less romantic: they’ve both done contract work for the military.

Ahh, contract work for the military, like a gondola ride in Venice.