Salisbury Plain
A big off road loop including a double crossing of the military training ground.
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Military Training Times
Old Marlborough Road from Everleigh to Durrington is usually open at all times. Heading south you keep the red flags (if flying) on your left and skirt the training ground.
Westdown Artillery Range is more active and mostly closed during the week. It's usually open at weekends and can be checked here - click the month required and the look for the firing dates for Larkhill/Westdown.