The Queen and the Duke of Edinburgh attended the Royal Marines Beating Retreat. The event traditionally marks the birthday of the Duke of Edinburgh, Captain General Royal Marines, and this year also marks the Royal Marines' 350th anniversary.
For more: A gallery from Zimbio.
Oh, just another week in the life of Her Maj: State Opening of Parliament this morning, some military pomp right here, then tomorrow off for a state visit to France and the D-Day anniversary commemorations, and then back in time for the Derby on Saturday...no problem. Anyway, here she's selected the appropriate badge instead of a decorative brooch, as you might expect.