That the objects of concern are running some sort of threat assessment/recon of American bases, and may be able to affect America's nuclear arsenal.
Could be some commie plant shutting off the breakers.
At least fifteen Soviet agents penetrated the OSS, with the actual number more likely around twenty. Soviet sympathizers and spies worked in OSS offices in Washington and the field. Some were hired precisely because they were Communists; Donovan wanted their help in dealing with partisan groups in Nazi-occupied Europe.
Could be some commie plant shutting off the breakers.