What about giving them "Survivalism 1" instead (maybe not for AT and Gunships), it seems most people don't like to take it on scouts, it would certainly help the AI to protect range 1 squishier units and it fits their raider role.
Seems like a really random promotion to give them, to be honest.
Also Skirmishers already get march at the third promotion, they wouldn't gain too much from the ability to go for survivalism instead. Would make sense for some unique unit however.