The Magazine of Fantasy & Science Fiction: February 1988 (Volume 74, Number 2)
Cover by David Hardy (for "Sentry.")

Novella: "Dancing Among Ghosts" by Jim Aikin.

Novelet: "Sentry" by Jack Dann & Jack C. Haldeman II (sequel to "High Steel" from 1982.)

Stories: "The Incredible Christmas Wish" by Nancy Etchemendy
"Takes All Kinds" by Russell Griffin
"Triage" by Rory Harper
"Salinity" (verse) by Robert Frazier
"If Nudity Offends You" by Elizabeth Moon.

Science: "The Unrecognized Danger" by Isaac Asimov.