I was going to start a new thread for a question I had, but I think it will fit here just fine.
Are NATO infantry battalions and/or armoured squadron able easily to "slide into" other nation's or NATO Brigade Combat Teams (or whatever their equivalents are)?
The reason I ask is that, NATO navies can do this. If you look at the two standing NATO maritime groups (SNMG1 and SNMG2), sometimes they are nothing more than a flag ship and a tanker, so not really much of a naval Task Group. However, any warship in NATO could at a moments notice be tasked to join that task group, and all they would have to do is read a copy of all the Task Groups latest OPTASK messages and they'd be more or less ready to fight alongside those other ships. No need for complicated task group work ups (though some level of integration training does make working together "better").
Could army battalions do the same? Could a Canadian infantry battalion that was on route to join the eFP in Latvia be re-tasked to join a BCT in Romania and just "slide right in" and fight effectively?