If you are at a dead end let's try some stuff as very rarely do you get a web hit on exactly what you are looking for especially when it comes to small WWII units. I do know that these JASCO guys did move around from unit to unit. (Please see number 2. as the 295th was in Luzon.)
2. Found a web site for the 295th JASCO.If they are this active it is worth contacting them for information on the 293rd, JASCO background info, training etc... http://jasco295.tripod.com/http://jasco295.tripod.com/
3. Other JASCO alumni groups: If you start asking questions you may find leads that take you to the members of 293rd etc..
286th Joint Assault Signal Company Mr. Stephen J. Semago 4212 Medical Drive, Apt 1703 San Antonio, TX 78229 (210) 692-1707
292nd Joint Assault Signal Co Mr. Charles Chirchirillo Phone (480)-991-8833 ScottsdaleAZ 85258 EMail: firstname.lastname@example.org
TWO contacts for the 593rd Joint Assault Signal Company LTC. Melvin E. Perez 6251 Forest Bend San Antonio, TX 78240-3335 Phone(210) 684-4499
593rd Joint Sig Assault Co (WWII) Mr. Roland W Erickson, Jr Phone(704)-567-8851 5309 Bellflower Ln CharlotteNC 28227-8104