The increases in XP levels are not linear ie: it takes more kills to advance from level 8 to 9 than it does from level 2 to 3.
IIRC it follows something called a Fibonacci series, which if i understand correctly means that the number of kills required for a soldier to reach 3 gold chevrons would be the sum of the number of kills required for 2 gold chevs plus the number of kill required for one gold chev. Also remember that RTW tracks xp by the soldier and not by unit what you see in the game is a average.
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