Kind of a stupid question

What is the Army Experience multiplier (upside down green triangle) that is used for calculating experience at the end of the battle? Where does it come from exactly?
I haven’t really paid attention in the past and it is the first multiplier used on the base amount before othe multipliers are added for BH, random faction selection, boosters and Premium.

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it’s your XP booster (in total)

Ya but what does it come from…it’s not always there, or is it?
Like when I noticed it , it was a 50%booster, with a battle hero one after it at 1.5, then the Premium one at another 1.5. Like do you earn it based off of an action in game?