Omroep Gelderland mails Bluetooth tracker to Dutch frigate Evertsen, follows it for 24 hours; MoD bans batteries in crew mail

Analysis
The battery-in-postcard ban closes one form factor and does not address the broader class of low-power tag devices, and the real exposure is methodological: forces-mail channels are too routine to flag and too individual to background-check at scale, handing any adversary service a working attack model without the attribution surface that comes with classical HUMINT targeting. The Evertsen's position off Cyprus carried modest intelligence value given the Charles de Gaulle group was operating in a declared exercise area, but methodology demonstrations travel independently of the specific disclosure's worth. Corroborated across Defense News and The Register, the incident is now a public template: within a year, at least one GRU or MSS service will very likely attempt an analogous approach against a Five Eyes vessel; NATO navies should very likely move to RF-sweep crew-mail packages at port entry within the coming months, and the consequential question is whether that shift precedes the adversary iteration.