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Originally Posted by Macunaima
OK, infantry can mount a transport, using all of its movement, correct?
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Yes.
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And it can dismount at any time without spending any movement at all correct?
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No. INF use all their movement to dismount, too.
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So, given this, why would you ever leave infantry units mounted? Likewise, what is the effective difference between carrying infantry units internally and externally?
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As noted, your assumption is false, which will help you understand why you would leave INF mounted. The part you are missing is that INF can't mount AND dismount during the same turn. They either spend all their movement to mount, or spend it to dismount (5.11.3); not both.
Since you are asking about Overruns, 8.06.1 matters. This is the only case where an INF that mounted can also dismount during the same turn.
The main reason you would leave INF mounted is to gain a speed advantage over time. It's rare that it happens in practice, especially during an overrun. Staying mounted during an overrun is suicide.
As for internal vs external, INF that are internal can't fire; they are sitting ducks. The only time that INF being internal is a good idea is using trucks on roads to move faster (M4 vs M3). It's unlikely the extra 1 hex will be enough of an advantage compared to having better defense options, though.