Modern equipment is gradually replacing obsolescent materiel in the JSDF. This European standard replaces BS4994-87 which is marked now as Current, Obsolescent, Superseded. He commanded a squadron of obsolescent biplane Gladiator fighters during the Greek Campaign in WWII. These fighters were to operate alongside the service's obsolescent F-104ASA Starfighters. All Athabaskan syllabic scripts are now obsolescent. Old and obsolescent control systems can be replaced. The tank was intended as a replacement for the venerable but obsolescent Renault FT. Obsolescent airplanes, for example, received more powerful engines and more sensitive radar sets. It was equipped with the obsolescent QF 2.95-inch mountain gun. The "D" model was later deemed an obsolescent design. Forms XI through XV exist but are rare and obsolescent. After becoming obsolescent, it was shut down in April 2009. The use of catch-words on every page enhanced "The Yellow Book"&apos;s link to the obsolescent. This usage is obsolescent in normal speech, appearing mainly in legal codes. As discussed above, motorcycle oils commonly still use the obsolescent SF/SG standard.