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Sorry for dumb@ss question but I don't have the 'dex.

When IG place units, is a whole platoon placed at the same time in different places or is each unit in the platoon placed at seperate times?

They follow the rules as listed on page 81 of the Warhammer 40,000 4th edition rulebook.

An IG platoon is a single FOC that is composed of several different units.

In general, the entire platoon is deployed at the same time. However, each unit may be placed wherever you like, they don't need to be adjacent. When rolling for reserves, a single roll is made for the entire platoon - again, it come in all at once, but each unit may move on in a different place.

There is an exception for the Light Infantry Doctrine, which is explicitly laid out in the FAQ. Light Infantry may be given to single units within a platoon, there is no need to give it to all units within a platoon. And LI lets that unit infiltrate in missions where infiltration is allowed.

Therefore, when you deploy a platoon which includes units with the LI doctrine, the LI units deploy after all normal forces are down, like any other infiltrator. If the platoon was in reserve for some reason, then the LI units would be able to infiltrate as normal, and the rest of the platoon would come in on a single reserves roll.

The much more popular Drop Troops doctrine is usually treated the same way: dropping units are held in reserve, and non-DT units are deployed at the beginning of the game. When Dropping a platoon which contains multiple DT units, then a single reserves roll is made for all of the DT units in that platoon, and they all come in or they all stay off.

However, nowhere does it explicitly state that you can do this. But nowhere does it state that you must give DT to each unit in a platoon either. The case could be made, RAW, that you must assign Drop Troops to the entire platoon, because there is no explicit exemption as there is in the case of LI. But most people treat them the same.

After all, it's not like the IG player is trying to take an empty Devilfish or anything...
(ducks and runs...)