THE territory's top security and tactical officers pushed themselves to the limit yesterday to raise money for charity. The Police Tactical Unit swelled the coffers of Operation Santa Claus by participating in a Challenge Day of competitive events. All 12 companies sponsored fellow officers who had formed teams for the charity challenge at the unit's headquarters in Fanling. This marks the third year the officers have joined the South China Morning Post/RTHK charity drive, which this year is raising funds for two organisations - Youth Outreach and Sowers Action. Youth Outreach is a crisis intervention group for runaways and their families, and Sowers Action, a Hong Kong-based group, aims to improve education for youngsters in the mainland. Teams took to yesterday's challenges with gusto. In the caterpillar walk, a relay of two teams of six each crossed the parade square carrying a bench between the legs of team members. In the food obstacle race, they again crossed the square, this time to finish an item of food before they could move on. Although the total amount of sponsorship money from the event is yet to be finalised, by last night $28,000 had been raised. Total donations have now reached $595,571. Meanwhile, armchair space buffs have the chance to win a commemorative Omega Speedmaster watch worth $89,900. Known as the 'moon watch', the Speedmaster has flown with NASA astronauts on every mission from early Gemini projects to Apollo and Spacelab to the current Shuttle programme. The Speedmaster presented to Operation Santa Claus is one of a limited edition individually numbered and engraved, and is in white gold with a silvered dial, white gold hour markers and hands and a transparent sapphire back. All cheques of $1,000 or more marked 'Watch' on the reverse will be put into an astronaut's hat and a draw will be made at the Godown Operation Santa Claus party on Monday, December 18. All cheques must be received by noon on that day. Cheques should be made payable to Operation Santa Claus 1995 and sent to Operation Santa, PO Box 70200, Kowloon Central Post Office. Donations can also be dropped in collection boxes at the following locations: Urban Properties at City One, Mei Foo Sun Chuen and Park Lane Shoppers Boulevard, all KPS, Esprit and Body Shop stores, Go Down, Conrad Hotel, Carnegies, Ritz-Carlton Hotel, Furama Hotel, Holiday Inn Golden Mile, Mad Dogs in Central and Tsim Sha Tsui, Jo Bananas, Ali Oli Delicatessen and Pepperoni's at Sai Kung, and KHF & Associates in Cheung Chau.