Why are certain TT not able to be donated in war?

[theBobNamedDan]

So I understand how airplanes can’t be donated to strongholds in war, but why can we not donate the “Wall Breacher Army L9”, “Anti-Tank Army L9” and “Armored Assult Army L9”?

all 3 are TTS obtained through the shipyard and they are piling up for me. If Helicopters can emerge from a stronghold why not these troops?

 

[theBobNamedDan]

https://imgur.com/a/Et0p0Eu