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US Military Seeks Biodegradable Bullets That Sprout Plants (newatlas.com)
The Department of Defense is looking at ways to clean up the hundreds of thousands of training rounds used by the U.S. army. It is putting out the call for the development of biodegradable ammunition loaded with seeds that sprout plans after being discharged. New Atlas reports: At military facilities across the U.S. and indeed around the world, a huge number of rounds are fired for training purposes, ranging from low-velocity 40 mm grenades, to mortars, to 155 mm artillery rounds. All of these feature components that can take hundreds of years to biodegrade, and falling onto the ground in such great numbers means that finding and cleaning them up is no small task. But left behind, they can corrode and pollute the soil and water supplies. So the Department of Defense has put out a call for proposals through the Small Business Innovation Research agency that solve the problem. The DoD describes the solution as a naturally occurring biodegradable material that can replace those used in current training rounds. It imagines that the biodegradable composites will be capable of holding bioengineered seeds inside (a technology it says has been demonstrated previously), that won't germinate until they have been in the ground for several months. Then plants will sprout from the discharged ammunition that actively remove soil contaminants and consume the other biodegradable components. Also imperative is that animals are able to safely consume the plants.
Yep. They do. Their annual ammunition buy is currently about 1.8 billion rounds a year, and essentially all of this gets used in training.
How many rounds do they use in actual combat operations? At the height of the Iraq War the U.S. expended only seventy two million rounds a year in combat. How many were they expending in training each year at that time? 1.1 billion rounds! The rate of training ammunition expenditure has since gone up, and is now 1.8 billion rounds. Before 9/11 the military had a less intense training regimen, they only expended 350 million rounds a year, but that was still five times more than the rate of expenditure in Iraq.
People are always astounded (incredulous, really) to learn that ammunition used in war these days is just round-off error in training ammo purchases.
So, yes, not having to clean up one or two billion casings a year would be a big benefit.
Second class citizen of the New Gilded Age
I don't know of any material with a density suitable for behaving properly as a projectile that doesn't contain toxic metals. The high-gravity-compound plastics have metal filler.
Ecomass is apparently a tungsten/polymer composite that was designed to meet current U.S. Army specs for nontoxic training ammunition. It of course has Tungsten powder in it which is somewhat toxic, however it is bound with a polymer, and is not nearly as environmentally toxic as lead. About the only compounds that you could use that would be less toxic would probably be Bismuth (which is used as a lead replacement). Of course you could also use silver, gold, and platinum, but that would be some mighty expensive bullets (of course even tungsten is very expensive compared to lead ~15x).
"Quit screwing around with these stupid "green" things when it comes to the military."
98% of all ordnance is expended in practice, and a small number of test ranges absorb most of this firepower. THIS is why green ordnance is a good idea.
I see a lot of people getting all bent out of shape at the absurdity of the concept of this SBIR topic. I am not a ballistics expert, so I can't comment on that, but please realize that the DoD funds 100s of these grants every year. Most of these, if they are phase I, are very small in scope - $100k - 200k. This is enough to pay a small team working part time to do a feasibility study, create a mock up, or develop a non-working prototype. It's a cheap (for the military) way of bouncing an idea off the wall.
In addition most SBIRs never make it past phase I development. In all likelihood, less will be spent on this program than is spent on a couple of hours of one of the training exercises they are talking about greening up.