here, pertti hartikainen regularly meets his friend lauri koskela.he was born in 1944 as the son of a wehrmacht soldier. koskela's father was killed in action here. the two have been friends since they were 15. but they didn't talk about their fathers, both soldiers in the wehrmacht, until a few years ago. they were used to keeping silent about it. but nowadays, they find it helps to remember them together. lauri koskela: even though i don't have any pictures of him, i have his name and my mother's notes. some don't know who their fathers were, so i'm glad i can come here and bring flowers. >> pertti hartikainen says visiting the cemetery is a kind of therapy for his friend lauri koskela. he himself found it important to take on german citizenship -- on paper and in fact. pertti hartikainen: i'm already over 70 years old. it may not be possible to learn a lot of german now, but i'm trying. >> pertti hartikainen plans to continue trying to gain acceptance in his father's country. damien: it's incredible to think that it's only recently that many count