When having a day or a moment when the loneliness of the deployment is overwhelming that you don't want to get out of bed. Or sitting a stop light and you start crying and can't stop because you see the couple in front of you give each other a sweet kiss and wish you could have your loved one beside you. Its an easy way of letting others that you are just DS'ing (deployment syndrome) without having to go into a long story.
Jamie: Is everything ok you are extremely quite tonight?
Lisa: I have been DS'ing (deployment syndrome) today, i'm ok.
Jamie: Aww got ya!