Beautiful Third Reich era postcard series "Die siegreichen Fahnen und Standarten der deutschen Wehrmacht" - "Victorious Flags & Banners of the German Armed Forces". The set contains 21 postcards. All 21 are available from Krause Papierwerke.
 
Here is the first set of  five (commanders):
Adolf Hitler - ObBHW (commander in chief of armed forces)
Wehrmacht (armed forces)
ObBH Heeres (army)
ObBH Luftwaffe (air-force)
ObBH Kriegsmarine (war navy)
The set 1 is available as aged (extremely convincing), or like-new (put in comment if you'd like this option). Pick what you need, or get all at 10% off.
 
The 2nd set (Army branches):
6. Infanterie (infantry)
7. Gebirgsjager (mountain troops)
8. Pioniere (engineers)
9. Nachrichten (signals)
10. Nebeltruppen (chemical weapons and smoke troops, later evolved into rocket artillery)
11. Artillerie (conventional artillery)
12. Kavallerie (cavalry)
13. Panzer (armored forces)
14. Fahrabteilung (transport troops)
 
And the final, 3rd set:
15. Luftwaffe (air-force)
16. Jagdflieger (fighters)
17. Flakartillerie (anti-aircraft artillery) 
18. Luftnachrichten (air-force signals)
19. Marine (surface navy)
20. U-Boote (submarines)
21. LSSAH (Leibstandarte SS Adolf Hitler) - elite unit of Waffen-SS