An Estonian newspaper recently revealed that a British soldier disobeyed a direct order to remove the SIM card from his cellphone before being deployed to a part of Estonia, approximately 90 miles west of the Russian border.
As a result of his refusal to engage in this element of operational security (opsec), the soldier, Daniel Barton-Kennedy, had his phone hacked, and nude photos of himself were stolen and used as blackmail against him.
Eventually, Barton-Kennedy was court-martialed for disobeying a lawful command, pled guilty, was reduced in rank, and ordered to serve 10 months in detention.