It's much more.
Clausewitzians submit to the view that warfare is a continuation of policy and meant to reduce the opposition's ability to resist enough to force an advantageous result of the conflict on them.
An occupation is no such thing. An occupation aims at running the country at least for some time, and whatever armed resistance appears may be long-lasting, but has to be suppressed in order to execute the occupation policies as intended.
'COIN' in a foreign country is about suppression, and there appears usually to be a conflict between the COIN and the purpose and premises of occupation.
An occupation can live with a small degree of suppressed armed resistance as long as critical policies can be carried out in parallel (such as setting up a puppet government with sufficiently loyal and effective security forces). COIN goes farther; it strives not merely to suppress, but to defeat the armed opposition.
I wrote quite the same interpretation half a decade ago already:
These {ISAF mission} statements are lacking an important part or a war mission: They do not tell that ISAF's mission was to defeat an enemy or to at least force warring parties to end warfare. ISAF is by official design not meant to win or end the war, but to add security and stability to Afghanistan till the Afghan government takes over.
It was meant to be an Afghanization project from day one (unlike OEF-A).
The clausewitzian understanding that war is about breaking the will of an enemy (if necessary by disarmament or death) is completely missing in ISAF's mission.
The job of ISAF is - as I read it - not to defeat the Taliban or any other group, but to assist the government (forces) and to provide security. It's a kind of policing job.
ISAF is more about buying time than about defeating an enemy.
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