This free software allows you to import a base map as a .jpg or .bmp image file and draw authentic NATO military symbols on top of it. It's easy to use, very versatile and it produces high quality graphics.
Please see below some examples of what can be done with it.
This is the tactical SITREP I made for a DCS Black Shark mission. Click the image for an expanded view.
This one from an ArmA 2 mission. Click on the image for an expanded view.
This other one for an OFPDR mission. Frontal assault, yikes! Click the image for an expanded view.