Time to bring in the Joes, then!
No need for the Army the police are handling things.
Those calling for the army want to normalise its involvement in domestic affairs, which you do not want to happen.
This joke may have been lost in cultural translation. He’s most likely referring to G.I.Joe since in the cartoon they were always fighting the organization called Cobra. Don’t think it was meant as anything else unless I’m missing something.
For those unaware, despite the awesome sounding acronym, a COBRA is a slightly dull meeting in the Cabinet Office Briefing Rooms.
They generally involve people at the top of the decision tree for the involved parties. The meetings for the foot-and-mouth outbreak for example brought in the highest levels of MAFF.