As a random twitter user posted, the obsession with sperm extraction suddenly makes sense if you view it through the lens of thinking that racial purity is very important.
And it also makes sense that they wouldn't have just frozen sperm before deployment - they believe their enemy is weak and they are invincible. It simply doesn't occur to them that they might die when faced with Palestinian resistance.
I think they just want to flex about how technologically advanced and how committed to racial purity they are -- like, in all cases this is totally unnecessary, there are plenty of Jewish men back "home" and if one were particularly worried and wanted a family w ones soldier lover, ones certainly getting a better batch of ones cum figuring this out beforehand.