The Master FAQ says:


So when i Planetfall a Landing Craft and i disembark it's troops as part of the Planetfall will this disembarkation trigger Overwatch?

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Not sure I understand the confusion. Seems pretty clear that it does.

You're not required to disembark as part of the Planetfall. You can always risk it and stay buttoned up and do a combined action later in the turn (3.1.3). But whenever the disembarking happens, they can be overwatched.

Morgan Vening

Doesn't OW only trigger at the end of a move though? So in theory you can disembark and hide behind the big ****-off War Engine?

Yes. You could just pile out the back and stand there. The planetfall craft would still be a viable target, though, because at that point the formations are still taking a combined action. AT/MW/TK fire is able to hit the planetfall craft, even if you can't see any infantry for AP fire.