It comes out of the woodwork with a $9 million grant from the US Army, that is true. On the other hand, the article states "LiquidPiston has been working on the

It comes out of the woodwork with a $9 million grant from the US Army, that is true. On the other hand, the article states "LiquidPiston has been working on these X-engines for nearly 20 years now, with numerous prototypes already tested in small planes (see above) and go-karts."