You can include images with blog posts. For example, this post includes an image of my "editor" Muttley. While not a military-related image, people do seem to like cats.
Seriously, you should consider including images when you have a good photo or illustration that "fits" your blog entries. You do need to have the legal rights to the image, or the image must be in the public domain. I encourage the use of photographs you've taken with a good camera.
Images attract readers!