This coloring page features a group of soldiers on a mission, marching in unison and carrying their guns. To give a sense of unity, try using a similar shade of grey for their uniforms. To provide a realistic look, use darker shades of grey for shadows and highlights to give textures and depth to the page. You could also use bright shades of yellow and red for their badges or for the metal of their guns, or color the sky blue for contrast and to add a sense of atmosphere and location. Finally, use brown for the ground and green for any foliage to liven up the scene. There are many possible ways to color the page, so use your creativity and make the scene unique and personalized.