11. Orange and white are the colors used by Signal units . 12. Likewise, those that began as Signals units typically feature orange. 13. He was then promoted to Commanding Officer of Signals units for two successive terms. 14. In the 1950s the Fort was used by the RAF ( 100 Signals Unit ). 15. The special signals unit was under the command of Captain W . A . Glassford. 16. The Signals Unit at Gailes was disbanded and the station placed on care and maintenance. 17. Ten years later, 91 Signals Unit was formed, and became fully operational on 5 October 1957. 18. The Army's signal units arrived only late in the battle, and the headquarters lacked adequate information. 19. During this campaign, Miles's special signals unit used the heliograph extensively, proving its worth in the field. 20. In 1953 the signal units were split from the engineer branch to form their own service branch.