Is it normal to be completely overwhelmed by fond memories?

I was going through my closet today, and I found my photo album filled with pictures of me when I was in the military. I saw how in shape I was, saw myself graduating from Basic Training, saw myself smiling proudly, and the nostalgia was just very overwhelming.

Old memories I've forgotten about suddenly started coming back to me. I remembered the struggles me and my battle buddies went through during Basic Training, how we bonded together during tough times, the jokes we told, the pranks we pulled, and how proud I was. It was one of the best times of my life, and I after I looked through the photo album I just laid in bed for about an hour or so thinking about my time in the military.

Is it normal to be so overwhelmed by fond memories?