Grrr...I don't want to get involved in another thread, but this is important. My knee jerk reaction is that this is another "grey area" in Traveller regarding militaries. For all we know even the IISS operates a meson cannon or two, or maybe even some planetary defense batteries (though I doubt it, and if so, then only in specific special cases).
The ambiguity is reflective of the official government militaries verse noble militaries verse any cross over because of nobility having government functions in parts of the Imperium.
Given all that, I would suggest including defensive batteries in both services. I would think the Army or COACC would operate those defenses based on a preplanned strategy. That is to say if a planet is seen as having valuable real estate, then I would think the Imperial Army would be the ones calling the shots (no pun intended) for defense of the world. On a more barren world that perhaps had lots of other assets, but didn't have a lot of valuable territory, then I would think the Imperial Navy might be manning those, or, it might be an arbitrary decision among the services dependent on force strength and staging needs; i.e. if an IA unit was need on a world with a strong navy presence for purposes of mobility, then the army might the ones manning the planetary defenses as opposed to the navy, and vice versa.
Just my take.
In short, even if the char gen tables don't offer the skill, that shouldn't discount the notion that the Army probably has a role in manning defenses. It's just not listed in the rules as such. Ergo perhaps this is errata or addendum material.
The ambiguity is reflective of the official government militaries verse noble militaries verse any cross over because of nobility having government functions in parts of the Imperium.
Given all that, I would suggest including defensive batteries in both services. I would think the Army or COACC would operate those defenses based on a preplanned strategy. That is to say if a planet is seen as having valuable real estate, then I would think the Imperial Army would be the ones calling the shots (no pun intended) for defense of the world. On a more barren world that perhaps had lots of other assets, but didn't have a lot of valuable territory, then I would think the Imperial Navy might be manning those, or, it might be an arbitrary decision among the services dependent on force strength and staging needs; i.e. if an IA unit was need on a world with a strong navy presence for purposes of mobility, then the army might the ones manning the planetary defenses as opposed to the navy, and vice versa.
Just my take.
In short, even if the char gen tables don't offer the skill, that shouldn't discount the notion that the Army probably has a role in manning defenses. It's just not listed in the rules as such. Ergo perhaps this is errata or addendum material.