The V-2 rocket was also called the A-4, or Aggregat 4, its technical name. The back of the diagram is stamped "Geheime Kommandosache" ("Secret Military Document").
This image is of a type-written letter by Ruth Heimburg in Deutsch. Sent from Ft. Bliss, Texas to her Father in Germany. Notably, Ruth asks her Father if her younger brother Dieter has been cooking his potato goulash as that is his "specialty."
The note was reproduced by Henderson National Bank in Huntsville as part of Alabama's sesquicentennial celebration in 1969. The reverse of the bill shows the sesquicentennial logo and an ad for the Huntsville Coin Show.