Some weapons recently revealed in a North Korean military parade appear to lack working delivery systems, the Commander of U.S. Forces Korea wrote on Wednesday, raising questions about their immediate utility.

North Korea rolled out a submarine-launched ballistic missile that it dubbed “the world’s strongest weapon” at a military parade in January, but a written statement to the U.S. House Armed Services Committee by General Robert Abrams raised doubts about that claim.

“Projecting a capability in a parade, while an effective communication strategy, does not necessarily equal the ability to deliver it,” he wrote. “In fact, there has been no reporting