I could use some help :) I know that you don't proofread, but I don't know where to ask.
I had been recruited to the Military on the 20th of October, 2013. As a combat service supporter in the Teleprocessing Corps, I had been through two months of boot camp, and after I'd finished the training, I was stationed in the Ranger's unit teleprocessing battalion, serving in the southern city of ****. I've had participated in the 2014 operation *** *****, and after that, I joined the commander's course. And that's how I finished my military service after three years.
This is the order: 1. Joined the military. 2. Boot camp for two months. 3. finished the training 4. Stationed in Rangers and as serving there for a while. 5. Participated in an operation. 6. Joined commanding course 7. Finished my service.
No longer a soldier.
Is the grammar on this ext correct? The usage of had been and the other perfect tenses?