Slitherine

I've tried duplicating entries from the tutorial campaign, but my custom campaign crashes.
Without the US Army entries, the campaign works.

From the data.cmp file:
...
[CORES]
usmc = marine_corps
usaCore = usa
trainingCore = usarmy
...

From the english.txt file:
....
core_usmc = US Marines
core_usaCore = US Air Force & Navy
core_trainingCore = US Army
...

Thanks

Using multiple cores is not (properly) supported. Put them into the same core

usaCore = marine_corps, usa, usarmy