The Union of Security Employees said that it stood firmly behind the officers, who had been placed in an "incredibly challenging operational environment". SINGAPORE: The Union of Security Employees (USE) said on Thursday (May 28) that it "stands firmly behind" the security guards involved in a confrontation with a Hong Kong school principal in which he swore at them .  The secondary school principal, Mr Lee Cheuk‑hing, who was on a trip to Singapore with a group of students, was seen arguing