This song is from the album Red vs. Blue Season 12 Soundtrack.
This tune was written for the character Freckles. Miles Luna and Nico spent a few hours at the office on the Monday following RTX in 2013. They fired up Halo 4, and got a general tempo from the walking animation of a Mantis. The machine sounds come from Jay Faircloth's old workplace which had lots of cool printing machinery and which Nico recorded. The whistling at the end is courtesy of Miles.