There are/were at least 8 Bands called "Blitzkrieg".

1) Blitzkrieg is a NWOBHM-band. Their song Blitzkrieg was covered by Metallica.
Visit the Official Blitzkrieg website - www.blitzed-alive.com

2) Blitzkrieg existed for a short time in the mid-1980s, in Sweden, but soon changed its name to Therion. 2 short Blitzkrieg tracks can be found on a fanclub CD issued by Therion and available in their webstore.

3) Blitzkrieg was a hardcore punk band that existed from the mid-80s to early-90s in the U.K. The lineup was Spike on vocals, Gaz and Ales on guitar, Mal on bass, and Freddie Doyle on drums.

4) Blitzkrieg was an anarcho-punk/hardcore punk band from the Netherlands that existed from 1982 untill 1984 and released one LP called "Complete Disarmament"

5) Blitzkrieg is a czech one-man project. Check website: http://www.bandzone.cz/blitzkrieg

6) Blitzkrieg was the name used by the german krautrock band Wallenstein when it was first founded

7) Blitzkrieg was a punk band from Hannover/germany with this name that has released a 7" on Nordtstadt in 1981 and was featured f.e. on the Lost&Found compilation "a golden shower of 72 hits". (http://www.punk-disco.com/A-E.htm)

8) Blitzkrieg was also punk band located in Novi Sad/Serbia, which played during 90's.