Which posture variation is described as flat back (military spine)?

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Recognize the flat back posture by the flattening of the lower spine due to a backward or posterior tilt of the pelvis. In this variation the lumbar lordosis diminishes, giving the impression of a straight, even spine from the sacrum up through the lower back. The pelvis tilts posteriorly, which reduces the natural curves and alters the alignment of the upper body to keep the trunk relatively upright. This contrasts with postures that exaggerate curves, where the thoracic kyphosis or lumbar lordosis remain pronounced, and with those that involve different pelvic or trunk positions such as rounded shoulders or sway back.