<Tr> <Th> Design </Th> <Td> A white field with the flag of Sri Lanka in the canton . </Td> </Tr> <Tr> <Td_colspan="2"> Variant flag of Sri Lanka </Td> </Tr> <Tr> <Th> Use </Th> <Td> Air Force ensign </Td> </Tr> <Tr> <Th> Proportion </Th> <Td> 1: 2 </Td> </Tr>

What does the flag with the green stripe mean