The category "<air_formation_nom>" can be expressed as follows:
box
champagne
combat spread
diamond
echelon east
echelon left
echelon north
echelon right
echelon south
echelon west
fluid four
gorilla
group
ladder
line abreast
offset box
pairs in trail
parade
section
spread four
stacked
staggered trail left
staggered trail right
stinger
tail
trail
unknown
vee
vic
wall
wedge