What does army commendation medal with 1 bronze oak leaf cluster mean?

The Army Commendation Medal (ACM) is awarded to soldiers for sustained acts of heroism or meritorious service. A bronze oak leaf cluster signifies that the individual has received this commendation more than once, with each cluster representing an additional award. Therefore, an Army Commendation Medal with one bronze oak leaf cluster indicates that the recipient has been recognized for their exceptional service on two separate occasions.