I WONDER - Did You Have To Be A Roman Citizen To Join The Army?

The transcript discusses the incentives for both Roman citizens and non-citizens to join the Roman army. Roman citizens who completed 20 years of service were rewarded with land or money, while non-citizens could earn Roman citizenship after 25 years of service. This citizenship was highly valued, making army service attractive to non-citizens.

How long did non-citizens need to serve in the army to be awarded Roman citizenship?

Why was having Roman citizenship considered a huge honor?