Two Extender oilers have joined the fleet A152 Kerocene and A153 Butane. Kerocene was completed 2 months ago but it's entry into service was delayed while it was used by DDS Engineering for evaluation of a future SUP upgrade programme.
Feeder transports A504 Henry and A505 George have also joined the fleet. The DDS are very happy with the Feeder class and may order further examples.
The Isometric-R sub-class which has internal modifications to allow longer patrols will be converted back to normal Isometric standard when the ships receive refits this year. The extra endurance is not being used and the DDS wish to standardise the fleet again. F121 Phanerzoic will be the first to be converted as it has just begun a refit.
