The logo itself needs to be simple enough to be etched into a knife blade or used on other branded gifts so less detail is better than more. This is another reason the slogan should be able to stand apart from the actual logo so they can be used together or separately depending on the need.
Our initial thought was to focus on a colonial Tricorn hat or soldier (to represent the "patriot" heritage) such as the attached patch image (but we don't want any skulls in the design). For more info on the type of info we put out, our main website is at http://www.ModernCombatAndSurvival.com
Main point to remember though is that it must be simple enough in design for etching, but detailed enough so that etching can be easily understood as to what it is and that it's related to our organization.
For example, I like the simplicity of the Tricorn hat in the patch attached as an image. But we cover 3 different training categories with our work: Self-Defense; Firearms Training; and "Urban Survival"....
... so maybe the design could easily have a replacement of a different "face" wearing the tricorn hat depending on each category. (For example, maybe there could be a simple patriot figure for the main logo... a gas mask face wearing the tricorn hat for our "survival" category... not sure what to put for "firearms training" and "self defense", but you get the picture.)