The Greenway, which links Hackney Wick to Pudding Mill Lane in Stratford, was closed from May and for the duration of the 2012 Games for security reasons.

BBC: Footpath and viewing point near Olympic Park reopens

Where heavy physical investments are foreseen, the concessionaires demand that the agreement with the host government include types of guarantee and levels of tenure security that are very similar to those associated with freehold rights, at least for the duration of the concession.

UNESCO: Madiodio Niasse on the risks associated with large-scale foreign land aquisitions | United Nations Educational, Scientific and Cultural Organization

And the duration of this transition period must be agreed, and the effectiveness of security arrangements must be demonstrated.

WHITEHOUSE: Moment of Opportunity: American Diplomacy in the Middle East & North Africa | The White House

Control would still reside with the contributing nation-state that hired the private security company, and contracts can be designed to maintain control of the duration of deployment and implementation of armed force.

CENTERFORSECURITYPOLICY: The Impact of Private Security on US Foreign Policy