There are 4 books in the Star Wars: Legends: Republic Commando - Legends series. The newest book is Order 66 which came out in 2008.

1
Hard Contact

Book cover of Hard Contact

As the Clone Wars rage, victory or defeat lies in the hands of elite squads who take on the toughest assignments in the galaxy ... On a mission to sabotage a chemical weapon research facility on a Separatist-held planet, four clone troopers operate under the very noses of their enemies.…

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2
Triple Zero

Book cover of Triple Zero
Dive into the epic series featuring the brave warriors of Omega Squad—an elite team of clone commandos fighting to protect the Galactic Republic.

Following the eruption of the bloody Clone Wars at the battle of Geonosis, both sides remain deadlocked in a stalemate that can be broken only by elite…

3
True Colors

Book cover of True Colors
As the savage Clone Wars rage unchecked, the Republic’s deadliest warriors face the grim truth that the Separatists aren’t their only enemy–or even their worst.

In the Grand Army’s desperate fight to crush the Separatists, the secret special ops missions of its elite clone warriors have never been more critical…

4
Order 66

Book cover of Order 66

The fourth novel in the Republic Commando series, where multiple storylines come to a head in the wake of Emperor Palpatine's issuing of the notorious Order 66.

When the order comes through, the clone troopers of Delta and Omega squads must decide whether to turn on their Jedi generals -…