JOHANNESBURG, March 13 (Reuters) - South African President Cyril Ramaphosa on Friday authorised the deployment of 2,200 members of the national defence force to help combat crime. JOHANNESBURG, March 13 (Reuters) - South African President Cyril Ramaphosa on Friday authorised the deployment of 2,200 members of the national defence force to help combat crime. * Ramaphosa said the deployment serves to prevent andcombat crime... [499 chars]