Maybe the MH 60S entry is miscategorized?
Since it is used for many different purposes, it could have been placed under Category 21 Utility Helicopter.
Regarding duplicate air domain categories, note that category 1-9 are fixed wing aircrafts and category 20-25 are helicopters.
Regards
Flemming Joergensen
########################################################################
To unsubscribe from the SAC-SWG-ENUM list, click the following link:
https://discussions.sisostds.org/index.htm?SUBED1=SAC-SWG-ENUM&A=1