Someone's got to stag on car parks and hang round outside underground stations telling foreigners where the stadium is. Which is apparently the limit on what the Army will be doing unless you have a really sexy job that the security contractors can't provide.
Dane-geld to the likeliest attackers would be both cheaper and safer, while allowing our brave lads and lasses to sit back and enjoy the spear throwing, foot races, leaping, etc, instead of mincing around the place looking menacing.
Edited to Add: Another important thought:
Dodgy looking bearded blokes roaming around in dish-dashes while toting Kalashnikovs, etc, would also reassure the world of the success of our multi-cultural policies.
(Ministers! You read it here first. And yes, I am available for consulting in all areas of national, foreign and security policy.)
Litter picking, car park directing and generally doing shit jobs lead to people signing off; that's cheaper than redundancy packages.
Whatever will the population at large (both the home and away flavours) think of seeing their 'heroes' picking up gash? Or will the gash picking be done by night shifts so nobody sees the dirty little secret of poor contract writing and management leading to soldiers doing all the work the contractor is being paid for..?