How to file VA cold injury residuals claim (DC 7122, Korean War + WWII POWs)

5-step Schema.org HowTo for cold injury residuals — particularly serving ~1.4M Korean War veterans still living (mostly 90+). 38 CFR 4.104 DC 7122 framework with 5 chronic residual categories: peripheral neuropathy, hypersensitivity (Raynaud's phenomenon), chronic pain, vascular damage, skin/nail changes. Per-limb rating + bilateral factor (38 CFR 4.26). Battle of Chosin Reservoir 1950 ("Frozen Chosin") + WWII POWs + Battle of the Bulge + Aleutian Islands + Korean DMZ winter patrols. Cascade: peripheral neuropathy → PAD → ED+SMC-K. Surviving family DIC pathway. Time-sensitive aging cohort.