Possible to make this feature work on US side?
 

I barely played the U Boat side of SH 4 1.5 but I recall could call in air support and surface units as a bit of special ability player would get.

In late war, esp in the Indochina coast, USN patrol bombers like PB4Y Privateer and USAAF B-25's began some coordination with subs in area in hunting what few ships were and for lifeguard duty. Wondering if could be modded so the special ability to call in aircraft could be used, and perhaps to call in AI subs (instead of surface ships) as well for wolfpacks on US side?

i tried...a while ago.
all i got was CTD.
i think/believe that there are two code sets in SH4: one for the German play which is heavily-reused logic from SH3 and one for the US side.
this is another manifestation of my belief.

but hey, give it a whirl. let me know if you want to collaborate.

I have idea where to start lol. Just wondered if it could be done.

The US side sends an air response anyway, when available, such as a nearby CV, or DD running to the area. The only thing you cannot do on the US side is call in a "scouting" run to find 'targets'. That's all that the German side's advantage with that is, and it is definitely non-historical. Ditch the grease pencil... lol

True. I found when testing wolfpack missions in campaign that the AI subs if within range will respond to contact reports, will attack. The surfaced ones, likely because as classified technically as DE's on roster, have best response but submerged ones will as well. Given they have to be pretty close, I would say within 15-20 miles, perhaps less, there are limitations.

My thinking is with the feature transferred over from U boat side, would be more interactive and likely to work. Could use it to call in AI subs in and aircraft to scout for you at one point, since that was done in later war off Indochina. Coordinated operations, read about it and there was a Silent Service episode, trying to remember the boat it featured. Basically, they were stepping on one another's toes in 45 off indochina, china coast, so they started coordinating for better results.