Military Aircraft Lighting

[Joseph Saragozza.]

This is probably a stupid question but I was wondering why military aircraft have a yellow strip in some areas along the fuselage and at night it’s a fluro green colour.

do these light up during the night like a solar panel or switched on in the flight deck?
and also what’s the name and purpose of it?

Thanks joe

RAAF C-17 day shot
http://www.jetphotos.net/viewphoto.p...6457852&nseq=5

USAF C-17 night shot
http://www.jetphotos.net/viewphoto.p...21991&nseq=117