When the F-35 flies over friendly countries for overseas deployments, you may notice some strange tags on the body of the otherwise sleek jet.

F-35 lunebergWhat are those? Lockheed Martin

Every angle and surface of the F-35 has been precisely machined to baffle radar waves, so little notches like the ones on the picture above would defeat the purpose of the weapons system that has cost about $400 billion so far.

Here’s the Marine Corps‘ F-35B flying clean: