Geolocation data, which is based on signals from electronic devices, indicated that both victims had been in the vicinity of G.R.U. vehicles when they began experiencing symptoms. Some officials believed that this was a smoking gun, and were annoyed by what they saw as the C.I.A.’s and the State Department’s reluctance to call out the Russians. “We’ve talked enough about this,” Chris Miller, the acting Secretary of Defense, said. “Let’s get after it. I mean, this is bullshit. Something’s going on. I thought we were well beyond the phase where we thought it was an unexplained mania or any shit like that.”