The phrase "a third tour of" is correct and usable in written English.
It can be used when referring to a third instance of a tour, whether it be a physical journey, a performance, or an event.
Example: "After completing two successful tours, the band is excited to announce a third tour of North America."
Alternatives: "a third round of" or "a third visit to".
We began by mounting a third tour of Something in the Air, our collaboration with aerial theatre company Ockham's Razor.
Mayor Clemmensen, whose son, Andrew, is in the Air Force and has just returned from a third tour of duty in Iraq, called that assessment "just appalling".
He was making his way back to Lindenhurst on Aug. 6, after a third tour of duty in Iraq, when he crossed paths with Pecora, who was on his way to Baghdad as part of a different kind of tour.
So far the things he has chosen to do include a second comedy series, "Extras"; a podcast; a handful of not-widely-seen movies; several stand-up tours; and two outings as the host of the Golden Globe Awards, with a third tour of duty coming on Sunday, Jan . 15
Jenkins looks set for a third tour of Lions duty and will challenge Ireland's Cian Healy for the loose-head jersey, with Toulon-based Andrew Sheridan a possible wildcard.
Andrew Sheridan, loitering in France with Toulon, may yet be summoned for a third tour of duty if Gatland decides the scrum is a potential source of Wallaby weakness the Lions can exploit.
Now, as the cloud completes a second tour of the earth, it is bringing even more difficulties with it.
On a second tour of duty, or with a friend along for reinforcements, one could see a little more of the country.
I want to see what the whole field looks like," said James B. Francis Jr., a Texas financier who was a national finance co-chairman of Mr. Romney's 2008 campaign but has not signed up for a second tour of duty.
"This is not just a matter of dollars and cents" for a region upended by the spill, Mr. Obama, who returned Tuesday from a fourth tour of the coast, said he had told Mr. Svanberg.
