I've looked at Drop Troops and their Grav Chutes and I just don't agree with the use of the Operate (Aeronautica) skill. This is the skill at flying the Valkyrie - which no Guardsman should have (let the Navy do the flying). Sure, true Jump Packs use the Operate (Aeronautica) skill, but those allow actual flight (for a short time) while the Grav Chute just lets you make a controlled fall. Way back in DH Grav Chutes used Acrobatics as the skill to land. I think that this is a better option.
I intend to replace Operate (Aeronautica) with Acrobatics in the description of the Grav Chute and to switch the starting skill for Drop Troops from Operate (Aeronautica) to Acrobatics. In addition to being more fitting, Acrobatics is likely to be a more useful skill to a Guardsman since they are not supposed to know how to fly aircraft and their opportunities for doing so are likely going to be very rare in any event.
In the desscription of operating vehicles it reads like they assume you are capable of operating anything outside of combat or advanced maneuvering. So that is to say that on a clear sky with no enemy contact a Guardsmen without ranks in Operate Aeronautica can more or less hold a stick straight and fly even until the pilot takes back over. A Guardsmen with ranks in Operate Aeronautica would actually be able to take off and land in a non-combat situation and would be able to maneuver in combat.
Having jumped out of real life aircraft Operate Aeronautica is more appropriate than Acrobatics. Acrobatics is the ability to control and contort your body and while that does play a role in sky diving it doesn't take into consideration your knowledge of Aerodynamics, fall rates, reading altimeters, and the actually Techy functions of the Grav chute itself. not to mention there is a talent that gives you llike a whopping +40 to Operate Aeronautica when using Grav chutes. but like I said, Acrobatics is only a part of the skills utilized within the Operate Aeronautica skill to safely make a Grav drop
I mean, I guess my solution would be to say that anybody with operate aeronuatica in a drop regiment doesn't necessarily know how to "fly" anything other than a grav chute, but if they had an intelligence of 35 or over (or whatever you dictate) they do know how to fly other Aeronautica.