The Army's font is called "G.I.". The Navy's is called "Liberator".
The Army uses photos with "warm tones and natural light". The Navy photo treatment is "high contrast...with a subtle steel gray overlay" for a cinematic tone.
The Army says “...under no circumstances may a weapon of any kind ever appear, in moving or still imagery, to be pointed in the direction of the lens; e.g., at the viewer.”
Read about the Army and Navy's style guides: https://www.beautifulpublicdata.com/army-navy-style-guides/