Question about the Eurofighter's air intakes.

In article ,
Vivek Thomas wrote:

But that's the purpose of a FOD walkdown, where
everybody available on the 'base' walks down the entire length of the runway
looking for and collecting all the debris that could get sucked into the
intakes.

I'm interested in which air forces do FOD walks and how
often? Which use some kind of machinery and how often?
--
Urban Fredriksson http://www.canit.se/%7Egriffon/
There is always a yet unknown alternative.