I cannot tell a lie.   Mongoose's Traveller, much like it's original namesake released in the 80's is a tough game.  Tougher than D&D. 

If you are squeamish about character death, you might want to sit this one out!

But if you like realistic, gritty combat and the chance that nobody is getting out of here alive, then pull up a chair and join us for a game of Traveller!