Create a charming illustration with a birthday theme that has an army-inspired motif. The design should include comical, friendly-looking creatures in army gear parading around a unique birthday cake designed to look like a sandbag fort. The scene should also feature 'Happy Birthday' pennants fluttering in the background tied to pencil-drawn tanks serving as party props. The entire piece should be set against a pastel-colored camouflage backdrop for added flair to the military-themed celebration.

Generated with these themes: Army.

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