You know what the Navy has too much of? Ships. It keeps building naval vessels to beef up its fleet, almost like that’s its job or something. Weird.

Well, Defense Secretary Ashton Carter wants to put a stop to that. On Thursday, he said that the Navy should stop using resources to buy and build littoral combat ships and instead invest in…jets!

“For the last several years, the Department of the Navy has overemphasized resources used to incrementally increase total ship numbers at the expense of critically needed investments in areas where our adversaries are not standing still, such as strike, ship survivability, electronic warfare and other capabilities,” Carter wrote in a memo.

Carter specifically wrote that the Navy should focus on buying more F-35s.

“The Navy’s strategic future requires more on focusing on posture, not only on presence, and more on new capabilities, not only on new ship numbers,” Carter said.

Jokes aside, there are actually several good arguments backing up Carter’s decision to eschew ships for jets. One reason is that the ships the Navy is building are expensive yet poorly made. For example, the USS Milwaukee cost $360 million to build, but that investment didn’t stop the vessel from breaking down in the middle of the ocean. Carter’s plan is expected to save the military branch $2-3 billion over five years.