Battle Action No. 175, cover dated 8 July 1978 saw the end of the road for Major Kurt Hellman and his Hammer Force with art by Mike Dorey.
In 1979 the character effectively continued in the pages of the new Tornado comic. In the story 'Wagner's Walk' the Hellman character was renamed Major Kurt Wagner and his trusty sidekicks Max and Dekker reappear as Karl and Gruber.
In the first issue of Tornado the pair are still disguised as Generals (as above) and in a later issue Gruber is even referred to as Dekker in a panel.
I don't know why they chose to rename the characters other than to perhaps give the strip a new start with Tornado. It would have been nice just to have seen the strip continue as Hellman.
Another strip in Tornado underwent a name change before its first issue was published. The Victor Drago strip (also with art by Mike Dorey) was originally to be published under the Sexton Blake name. I understand the decision to change the name in that case was down to a rights issue over who actually owned the character (which wouldn't have been the case with Hellman).
Treasury of British Comics.