Sienar Sentinels, abbreviated ISS, were picket ships that served the starfleet of the Imperial Remnant under Head of State Jagged Fel. Imperial Sienar Sentinels enforced his Home Fleet's blockade of the planet Exodo II and the remains of the moon Boreleo, but Abeloth slipped past the siege and contacted the rival Imperial Admiral Natasi Daala in 44 ABY. The starship shared its name with the manufacturer Sienar Fleet Systems.