A failure may prevent a (stability fund) from raising money.
A plan may accomplish a goal of preventing (market contagion).
Conditions may prevent some schools from reopenning after a vacation.
A (missile defense system) may be aimed at preventing (missile attacks).
A deadlock may prevent parliament from electing a president.
(Battlefield tours) may prevent a military from improving an ability.
An official may credit iraqi police with preventing casualties.
Guards may prevent a male from entering the (parade ground) of a (police academy).
Some (dozen policemen) may prevent protesters from entering an (embassy compound).