Yeah I'd vote for Jeremy, I'd vote for him to be put in cement up to the neck. Then I'd wait till it sets, squat over his head and curl out a long brown turn onto his forehead - smiling with satisfaction as it slides down his grumpy face.
By your own standards then surely those who are serving can do whatever the hell they like with their ballot paper. And what a pityful excuse to either vote Tory or Labour, yeah they are both shite but what other choice do you really have?
Why should the political parties care about wasted votes? An apathetic electorate plays right into their hands as they then only need to put effort into pleasing the voting areas that will affect them. They know they have the party faithful so no need to put any effort in there.
One of the things that make political parties strategists uneasy is nonaligned opinionated voters, these are the ones who can make a difference. Another type of voter they fear is when a demographic group organise themselves into a voting block for the sake of protest, much like the pensioners did a few elections ago. The Tories sh1t themselves and spent a lot of money and effort to break them up.
So don't waste your votes, get together and make it known that you intend to vote for one particular party en-masse. It will have more sway.