I'm curious how the Space Marine Transports rules work with regards Garrisoning.

From 6.1.5
"Formations where no more than one of the units has a move greater than 15cms, and where none of the units are war engines"

From 6.3.1
"Also note that you don’t have to take Rhinos if you don’t want to. If you’d rather field the formation on foot instead, so it can act as a garrison for example, or be transported in a Thunderhawk Gunship, then you may do so."

"Choosing transport options is part of the army selection process. Portions of a formation may be left behind during deployment (to garrison, for example) the decision to exchange options, even “freeâ€Â

You can choose to dump any selection of units before deployment.

Devastator Squad w 2 Rhinos
Is it OK to drop 1 Rhino but keep the other, for a Garrison? Or is it all or nothing?

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Neal

To expand on Neal's comments, there are two separate principles here; buying the army and dropping units for garrisoning purposes.

When buying transport the general rule is that all the infantry must be provided with transport. SM transport rules are a little tricky, but in summary, you buy Land Raiders then Razorbacks and only if there are some infantry still 'walking' do you get sufficient Rhinos to carry them.

Having bought the transport, you are no longer required to ensure that the whole lot can be transported when garrisoning, so 'mechanised' infantry may elect to drop some or all of their associated vehicles in order to comply with the garrisoning restrictions. Also note that you do not get BMs for dropping vehicles in this way before the start of the game.

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"Play up and play the game"

Vitai lampada
Sir Hemry Newbolt