The Centre has extended a Z category cover of armed CRPF commandos to the opposition's presidential candidate Yashwant Sinha, officials said on Friday. The squad has taken over the task after the Union home ministry directed the Central Reserve Police Force (CRPF) VIP security wing to ensure protection to the 84-year-old Sinha. The armed personnel, about eight to ten working in shifts, will escort Sinha whenever he moves across the country, they said.