I just stumbled across the Streamlight Knuckle Head flashlight. Its designed to run on primary AA batteries, can be purchased in a floodlight design, will runs on NiMH batteries if that is useful. I'm going to borrow or buy one for the rural nighttime test toward the end of April. It might not be enough given it's 200 lumen on high rating but it's the first light I've found that is meant to be a flood light. Looking at the way the reflector is shaped it may have the kind of horizontal light spread that is to be had out of some bicycle headlights. Probably not bright enough, going by what many of you have been saying, but it won't hurt to have a former counselor and camp staff person try it out. Part of my confusion comes from the feedback I got on having 200 lumen headlights for campers. Many contributors said that 200 lumens would be way too bright. When the program folks tried out the the lower levels that some of you recommended they found those contributors were right. So maybe 200 Lumens will be enough when coming out of a purpose designed flood reflector. We shall see!
That's definitely worth a look, TD. While you're browsing the SL catalog, also take a look at this. I'm not at all certain it would be ideal for you, but only that it too is perhaps worth at least a look. It uses 2 LEDs, one for flood, and one for spot, integrated into the same reflector assy (much like an SL headlight I have used at work in the past, which worked very well for me). They are controlled separately by dedicated switches on alternate sides of the body (but can be operated simultaneously / independently). The 'flood' section alone is 'only' 175 lumens, which might or might not be sufficient(?). Run time on 'Spot' is rated 8.5 hours, though keep in mind that FL1 rates that down to 10% of initial output, which is not likely a usable level for your application, so your actual use time would be less. Users would need to be prepared to swap cells as required. The 'beam distance' of the 'flood' section is listed at 39 meters, which, the way that's rated (down to .25 Lux) means the usable distance for such searching might be only 1/3 or half that (?) and might be insufficient. The 'flood' distribution pattern it has might provide the desired near-field coverage pattern though, without a lot of distracting / unnecessary extraneous illumination of surroundings, upper branches of vegetation, etc., and should be fairly evenly distributed over its coverage. It runs on 3xAA, is a fairly friendly form factor / weight, is fairly rugged (ANSI FL1 2-meter impact rating and reasonable ingress rating), hi-vis color, and would be easily operated by most adults. The 'spot' function could also be a useful thing to have on tap and easily available for use as needed, and for other purposes / situations.
One thing to consider, which I don't think has been mentioned, is color rendition for such searching in such conditions. (BTW, having lived in Owings Mills, Columbia, and Herndon, I'm somewhat familiar with the terrain / foliage you might be operating in.) I'm not going to get down into the esoteric weeds as some are wont to do around here with spectral analysis and endless theorizing, but will simply say that a light with a decent color rendering index rating (CRI) of 90+ would be substantially better for such searches than your average LED flashlight with something well below that. That is based on my personal experience and experimentation outdoors at night, not charts, graphs, and theorizing. Not only does it allow one to better resolve details / variations in coloration / shading of the natural terrain, but perhaps more importantly in your application, it would greatly enhance one's ability to detect and resolve un-natural things in the surroundings (such as the coloration of campers' clothing, etc. - assuming they aren't wearing camo); thus I think that is worthy of consideration as a criterion. The 'flood' section of this light is rated at 90 CRI, which is quite adequate.
This is not an outright, fully-considered recommendation (I don't have enough data to do that), but rather just something else I think is worthy of consideration in your product search. It could possibly be worth buying one to try, as they aren't terribly expensive. You might also consider giving SL a call to see if anyone has an opinion. Remember, this is SL, so they're in your time zone and speak English! As you likely already know, from this product page, open the 'Documentation +' menu for the Data Sheet, Fact Sheet, etc. for the full details.