sentences:  Both and underwent a modernization and refit, replacing 4 of their 8 100mm guns with 2 Crotale air-defense systems.In 1997, "Foch" also received 2 Sadral launchers (for 6 Mistral missiles each); those launchers were purchased by France in 1994.They would also have longer careers (until 1998 and 2000) when compared with the "Audacious"-class carriers, which were withdrawn in 1972 and 1978.