Even with an invitation to the White House, it can be tricky to get through the heavily guarded perimeter.
For example, he describes the terrifying messiness at Russian nuclear-fuel stores, including one where staff use holes in the perimeter fence as a private entrance.
As the Moon blocked just the central portion of the Sun, people looking skyward would have seen a fiery ring around the Moon's perimeter, what is known as an annular eclipse.
Guards patrolled the perimeter of the airfield.
Bowen is limited offensively but he remains one of the NBA's finest perimeter defenders.
However, at the perimeter of harbours, you'll often find a curious group of people standing around in waterproof clothing, armed with binoculars and pads.
The perimeter of the cylindrical building is lined with classrooms and waiting areas, so that children can daydream while looking out the window and gazing at the old tree.
Traps for predators were set around the perimeter.
With a tingle of horror, Harry saw in the distance a huge, batlike shape flying through the darkness toward the perimeter wall.
A fence marked the perimeter of the field.
And they had to escort players from both teams from the field, as home supporters hurled a barrage of objects over the perimeter fence.
The barbed wire fence round the perimeter discouraged intruders.
Bynum provides the shot blocking and interior presence the Lakers lacked during the Finals last year, while Ariza has shown the length and quickness of a perimeter defensive stopper.
With massive glacier-scooped lakes fringing its perimeter and with goats, sheep and grizzly bears in relative abundance, glacier is a photographer's paradise.
This is the outside perimeter, not the security perimeter.
But let me not go too far in suggesting that asset classes near the perimeter of risk have no future.
Blue flags define the excavation perimeter, while yellow ones mark the location of fossils or stone tools.