From what I understand the problem with Vasagel isn't it's efficacy but with the reversibility. You can remove it from the tubes easily but the sperm might not perform as before.
That's not how it works in Germany. You can't just pull in the small number of men you need to fill up your quota. That violates the Wehrgerechtigkeit and is the biggest reason conscription was frozen in the first place.
From what I understand the problem with Vasagel isn't it's efficacy but with the reversibility. You can remove it from the tubes easily but the sperm might not perform as before.