"two", "three", "four", "five" and "six" I think......
I think you're right. They're whole routine including walkout is timed/done to a sing-songy collection of phrases etc. The walkout is something like this:
<<Lined up at attention, at "Ready, and 1" they start their walk>>
Boss: "Ready, and 1 2 3 4 snap pop salute, see ya" <<turns to aircraft>>
All: "See ya boss" <<keeps walking>>
2: "1 2 3 4 5 6 7 8 see ya" <<turns to aircraft>>
All remaining: "See ya 2" <<keeps walking>>
3: "1 2 3 4 5 6 7 8 see ya" <<turns to aircraft>>
All remaining: "See ya 3" <<keeps walking>>
etc etc. I saw it on a documentary that used to be on the Military Channel "Blue Angels: A Year in the Life"