Do you mean the cultures?
Generally, people share their ideas, become more open minded, allow more variety and adopt the other's cultures inventions. Sometimes, however, this is destructive and conflicts happen, and in extreme cases even wars.
I believe the answer is: Senior Rater
The assessment that they make to rate the soldier would be based on various factors such as academic standard, ability to follow instructions, personal accomplishment, etc. The scores would be used as a basis to determine who would obtain future promotions
There is a capital difference between all the other civilizations mentioned, even if Greeks were heavily influenced by them and adopted many of their advancements and scientifical discoveries or art, technology and so far.
