Agree on the irrigation syringe, 60cc is a little big - 12 cc syringes are available from NOLS. Although you'll want to squirt at least a liter to irrigate any wound in the field, its best to use a smaller syringe that you can hold and direct more accurately at the wound and anything contaminating it.
What kind of roll tape do you have? At least 2 rolls here, good sturdy stuff that won't peel off without effort. Every Scout should also carry tape in their personal FAK, but I didn't notice any in this Troop FAK.
I vote for 3-4 more triangular bandages. Its not that you're going to end up with 4 Scouts with broken arms at one outing, its that they are very handy for packaging a fracture. Tie the tri bandages around the broken limb surrounding the splint material and padding, avoiding where the break occurs. It tends to take at least 3-4. Again NOLS sells some cheap muslin cravats that are pretty ideal for this. Cheap, lightweight, don't take up much space.
fwiw We found the SAM splint really only worked for arm fractures (surrounding the elbow) and maybe for a lower leg. For most other splints an inflatable sleeping pad cushioned with sweaters and t-shirts did the best. Splinting with walking sticks and backpack straps and poles will work, but you need to cushion every bit of that carefully to make it comfortable for your victim. Inflatable pads, triangular bandages, sweaters - much easier.
It looks like all your nitrile gloves are size Small - will adults use this FAK? Pack some Med or Large as well.
Double or triple up on the moleskin, gauge how much the Troop uses after the first hike or two. Same goes with all sorts of band aids - you might consider focussing on 1-2 only. fwiw I love knuckle bandaids, the cloth ones, they really cover a wound nice, and I find between that and a couple finger tip bandaids I can get by nicely.
Cinder Suds soap - not familiar with it, if its equivalent to Green Soap pads (also from NOLS - I'm beginning to sound like I work for them, sorry) then that should work fine.
Butterfly bandages - I'll go out on a limb here and suggest you're better off with wound closure strips and a wound treating system, something like this (from NOLS of course) -
http://www.nols.edu/store/product.php?productid=16259&cat=266&page=2. There are at least a few major advantages to the wound treatment system - its more compact than any other bandaging system for open cuts, buy one and hold it up next to what you expect to treat a wound with conventionally and you'll see what I mean; at $4 its pretty inexpensive (not cheap, but not expensive); its meant to be applied and stay on the wound for days, or until healed. If you treat conventionally you need to pull the bandage, retreat, and reapply the bandage or new bandage at least once a day. On day 2 of a 5 day hike that's kind of inconvenient and will suck the bottom out of your FAK supplies pretty quick. You can still pull up the wound treatment bandage but don't have to unless you notice some infection to treat, which you can see through the window on the bandage itself. I had a chance to put the wound closure strips on a gash on my wrist which might have required a stitch or two, it healed very nicely and now I only have a dainty scar.
Ditto on the paper and pencil and FAK book (compact) to go with this. You'll need to make notes on your victim, and have that ready to communicate to rescuers. Good FAKs come with 2-3 pages filled out with vital info to collect. Get a smaller pencil from a local golf course, they don't break easily and last a while. The FAK book is your entertainment, reading for rainy days in the tent and just before lights out - you never know when you'll be expected to treat what happens on page 32.
Headlamp in lieu of the penlight - you'd end up holding a penlight in your mouth. It doesn't inspire confidence in your victim. If you don't have one already Doug Ritter makes a headlamp for $15.95 that should be an EDC.
Make sure your Scout Leaders poll the troop to find out who has any allergies, especially to bee venom, then make sure they carry an epipen or two when participating in *any* outdoor Troop event (especially bbqs). Then make sure everyone (or at least you) know where they carry it. You won't have alot of time to dick around in someone's pack looking for it if they are stung. You will want to know how to inject it, instructions are on the epipen. After one injection, get some benadryl (anti-histamine) down them as quickly as you can, and prepare to give them the second epipen injection. I favor liquid or melting tape type benadryl on the off chance they are having breathing problems and have trouble chewing and swallowing - but frankly I've only had to administer once, so I can't say its positively any better (it is a little more expensive in liquid or gelcap form).
Good Troop FAK climberslacker! Be prepared to adjust and improvise and even throw away something against the advice of us old farts. Newer better first aid items come along all the time.