Leadeships Secrets of the Rogue Warrior is a good read and is a no nonsense leadership manual. The book is based around the famous Rogue Warrior Ten Commandments below. Another good book in that vein that may still be available is Patton's Principles. I wasn't written by the general but was distilled from his leadership maxims. An intersting side note to the Marcinko discussion is from Mike Walsh's book Seal! where Walsh describes his Seal team 6 interview, Walsh did not have a favorable impression of Demo Dick and his team to say the least.
1. I am the War Lord and the wrathful God of Combat
and I will always lead you from the front, not the rear.
2. I will treat you all alike
just like #%@.
3. Thou shalt do nothing I will not do first,
and thus will you be created Warriors in My deadly image.
4. I shall punish thy bodies
because the more though sweatest in training,
the less thou bleedest in combat.
5. Indeed, if thou hurteth in thy efforts
and thou suffer painful dings,
the thou art Doing it Right.
6. Thou hast not to like it
thou hast just to do it.
7. Thou shalt Keep it Simple, Stupid.
8. Thou shalt never assume.
9. Verily, thou art not paid for thy methods,
but for thy results, by which meaneth
thou shalt kill thine enemy
by any means available before he killeth you.
10. Thou shalt, in the Warriors Mind and Soul,
always remember My ultimate and final Commandment:
There Are No Rules -- Thou Shalt Win at All Cost.