The lead vessel underwent a long and extensive process of testing after its "launch" in July 2009.

The lead vessel headed toward my own, and I moved forward to meet it.

"The transmission appears to be coming from the lead vessel."

Then she disappeared, and the captain of the lead vessel swelled onto the screen.

The lead vessel of the class commissioned on 29 April 2010.

The lead vessel of the class was launched on 30 March 2006.

As the lead vessel, the class name should have been Thresher-class.

The class and the lead vessel have been named for the Shivalik hills.

I mean, yours was supposed to be the lead vessel.

She was the lead vessel in the class.