Navy SEALs are supposed to be stealthy. But maybe not this stealthy.

A federally registered campaign committee called “SEALs for Truth” this week donated $1.975 million to Missouri gubernatorial candidate Eric Greitens, a former SEAL. It is, by far, the single largest political contribution in Missouri history to an individual candidate.

And we have absolutely no idea who it came from.

That’s because “SEALs for Truth,” which was registered as a federal “super PAC” in mid-June, reported having no money on hand as of June 30. That’s the cutoff date for committees to make their second-quarter finances public. Any money the committee receives after June 30 doesn’t have to be reported until the third-quarter report, due Oct. 15.

In other words, the group received the $1.975 million during the roughly two weeks between July 1 and Monday, when it donated the cash to Greitens. But the group does not have to publicly reveal where that money originally came from until later in the year — well after Missouri’s Aug. 2 primaries are over.

How could a committee operating under federal limits have raised that much money so quickly?