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O-O line

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A line for the coordination of field artillery observation, designated by the corps or force artillery commander and dividing primary responsibility for observation between the corps or force artillery and division artillery.

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O'Higgins
O'Keeffe
O'Kelly
O'Neill
O'odham
O'Toole
O-level

O-O line
O-ring
o.
O. Henry
o.b.o.
o.c.
o.d.
O.E.D.

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