There is a military museum about 15 miles from where i live, that has old retired military hardware. Tanks, Planes, Jeeps, Motorcycles, etc. Ever seen a Civil War-era Submarine? That thought scares me just looking at it. Not very big...looks like a sinking death chamber. Those guys were taking their life in the hands just going underwater in that thing.
One just has to hope that the biggest concern / issue is the cost - and not it's mobilisation and use in conflict