Here are 2 sites I found somewhat helpful, though I think we're all screwed for a while until they release it:

http://www.theunit-hq.net/news-and-updates/the-unit-theme-song.html
http://www.post-gazette.com/pg/06146/693214-238.stm

That second site has a Q&A about "The Unit" with some information in the answer.

nuncamas_bz3, August 6, 2006; 2:15 AM

heres a site where you can find all 'the unit' songs http://www.theunit-hq.net/the-songs/the-unit-songs.html
enjoy

playgirl_pd03, October 17, 2006; 11:24 AM

Robert Duncan did the main song that is a cadence from the military. I was able to find Robert Duncan on Myspace with an extended remix of that song. No download available for it but you can add it to your profile if you have one. Here is Robert Duncan's link: http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&;friendID=31994448

robm24, December 22, 2006; 7:48 PM

try www.tv.com there are forum about this song too
you can try to contact that man who says that he can send this song to e-mail

guardianangel89, January 1, 2007; 7:49 PM

I love this song and it is a great workout motivator. I think these are the lyrics if anyone is interested or can clarify, please do so:

The Unit Theme Song by Robert Duncan

Leader Response
Hard up Hard up
Fired up Fired Up
Doing some Push ups
Hard up Hard up
Fired up Fired Up
Doing some Push ups
Wouldn't want to be you Wouldn't want to be you
But if I got to be you But if I got to be you
Feel's Good Feel's Good
Sounds Good Sounds good
Hard up Hard up
And so on…….


mrgbb, November 14, 2007; 9:28 AM

Hello to you all, I just logged in this once to tell you that if you download iTunes to your Windows/Mac computers you can buy this online directly from the iTunes music store as I just bought it today!
You will of course need to have an iTunes account to set up before you can do this, when in iTunes search for The Unit and it should come up with the correct score from Robert Duncan.
Hope this helps and enjoy!

guy.cooper, August 20, 2008; 6:18 PM

Hi all, Robert Duncan made a remix of the song Fired up... Feels good from the album Run To Cadence With The U.s. Army Marines, Vol.2.

Duncan's song can be found on http://www.myspace.com/robertduncan

So based on that song, the lyrics of the theme of the Unit (extended version see Duncan's myspace) are:

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.

Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.


Uuuh-Uuuh, Uuuh-Uuuh.
Feels Good, Feels Good.
A-lo righta lay-eft, A-lo righta lay-eft.
A-Lefty righta lay-eft, A-Lefty righta

Feels good, Feels good.
Sounds good, Sounds good.

Uuuh-Uuuh, Uuuh-Uuuh.
Feels Good, Feels Good.
Hey bobba reeba, Hey bobba reeba.
Hey bobba reeba, Hey bobba reeba.
A-lo righta lay-eft, A-lo righta lay-eft.


Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.



Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up, Fired up.
Fired up, Fired up.
27th, 27th.
Fired up, Fired up.
Here we go, Here we go.
On the Road, On the Road.
27th, 27th.
Fired up, Fired up.

Fired up...

citizenjazz, August 8, 2011; 7:52 AM

Another thing, note than in the original song (not the one you can here on Run To Cadence With The U.s. Army Marines, Vol.2) instead of:

Fired up, Fired up
27

it is:
Fired up, Fired up
plenty sun


The 27 is most likely the Company they belong to, and they adapted the song to their Company

citizenjazz, August 8, 2011; 8:04 AM