Republic of Guatemala (modern)
Who & why: the flag and coat of arms already restored in 1871 are pinned down in precise legal detail by Decree No. 12 of 12 September 1968, which fixes the exact rendering of the crossed rifles, crossed swords, laurel wreath, and the scroll reading "Libertad 15 de Septiembre de 1821." The design itself does not change — only its specification does — and Guatemala lives through decades of civil war (1960–1996) and a fragile peace under this same banner.
What it represents: the vertical blue-white-blue inherited from the federation, with the resplendent quetzal (Guatemala's national bird, a symbol of liberty since it reputedly cannot survive in captivity) perched on the independence scroll at the center of the white stripe.