
The Ministry of Defence (MoD) is staging a military exercise over mid Wales and parts of the south of England for the next nine days.
The exercise is designed to help train soldiers ahead of deployment to an "operational theatre".
Much of the training, which will involve the RAF and the Army, will take place in Sennybridge, near Brecon.
Among the aircraft taking part are Apache and Chinook helicopters and Tornado GR-4 jets.
The RAF said the majority of the air activity, which may include low flying, will take place during daylight hours, but there will be some at night and over the weekend.
Exercise Herrick 11 is designed to provide "essential training for No 11 Light Brigade", said officials.
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