Kancolle. Song played at the night talk before reassignment to other fleets
Yes, the composer is Natsumi Kameoka. You can find the song in this official OST, TV Animation "Kantai Collection -Kan Colle-" Original Soundtrack "Kankyo" Vol.1.

The song is on Disc 2, track #25 titled CHINJU FU (鎮守府) you can hear the sample here.