Loures was founded on 13 August 1913 by local footballers who used to play in a plot of land called Casaréus in Loures. Their first ever game was a 3–1 friendly win over Sporting CP. In the 1950s, the club added facilities for cycling, athletics, table tennis, and roller hockey. In 1978 they added handball, and in 2004 futsal.
Colours and badge
Castrense's colours are yellow and black.
Notable former players
The following players have either achieved senior international caps, or made significant appearances in professional top-flight leagues before, during, or after their time at the club:
Panutche Camará – Guinea-Bissau international midfielder who played in the English Football League for Ipswich Town and Plymouth Argyle after spending part of his youth development at Loures.
Gonçalo Gregório – Striker who played on loan at Loures early in his career; went on to play top-tier football in Romania and Armenia, and became a top scorer in the Armenian Premier League with Noah.
Au Yeung Yiu Chung – Hong Kong international midfielder who had a spell with Loures in 2015, notable for becoming the first Hong Kong player to sign for a J.League club.
Ballack – Cape Verdean forward who scored a career-high 11 goals for Loures during the 2015–16 season, earning a move back to the professional divisions with Cova da Piedade.
Hugo Machado – Midfielder with a wandering international career that included top-flight campaigns in Cyprus, Iran, India, and Azerbaijan.
Manuel Liz – Right winger who played for Loures during the 2018–19 season; previously made his professional debut in the Segunda Liga with Atlético CP.