This is Red Two flying toward you.
3 seconds sound clip from the Star Wars: Episode IV - A New Hope (1977) movie soundboard.
You can hear this line at 01:51:27 in the Blu-ray version of the movie.
Quote context
[...]
- Should I have your ship standing by?
- Evacuate in our moment of triumph? I think you overestimate their chances.
- Rebel base, three minutes and closing.
- Red boys, this is Red Leader.
- This is Red Two flying toward you.
- Red Leader, this is Base One.
- Keep half your group out of range for the next run.
- Copy, Base One. Luke, take Red Two and Three.
- Hold up here and wait for my signal to start your run.
[...]