Three lights under american planes wings.

[gumbo limbo]

Hi, what does these three lights (yellow, red, green) under the american planes wings meant?

 

[fubar57]

Recognition lights... Identification lights.. how were they used?

 

[gumbo limbo]

Recognition lights... Identification lights.. how were they used?

Thank you

 

[Crimea_River]

Not just American. Some British as well.