Mark: if it is going to be a pun (allowing for the fact that the Swiss Navy have much in common with the Romney Marsh Mountain Rescue Team) then it will probably turn on the word Naval/navel

Although he hasn't given the answers, Raedwulf appears to be lowering the tone, but I'm sure I can match it.

1, What's long and thin,
covered in skin,
hard in parts,
and goes in tarts?

2, What goes in dry, comes out wet, and satisfies two people ?

3, What's long and thin, slightly greasy,
when it's in it moves so easy,
when it's out it flops about?

Nigel