The Saga of Tanya the Evil, Vol. 16 (manga)

After somehow managing to live through the most grueling battle of theirentire careers, Tanya and the 203rd receive a letter from the General Staff. Itscontents are, essentially, -Hop on these rockets and go smash up theRepublican Army-s HQ. Oh, and be sure to come back from thistechnologically unprecedented flight alive once you-re done with yourabsurdly dangerous mission!-