It seems to be that US army really using Java. At least they are recruting Java programmers. Take a look here.
* Java, J2EE - at least 2-3 years
* Struts framework - at least 1 year
* Oracle, Sybase, DB2 or any other major database - at least 2 years
* XML - 1-2 years
* UML - at least general understanding
* Documentum - nice to have, no mandatory
Well, Struts +1 !