I doubt the green thing has any weight. The JAP isn't based on any single Service's practices; it's shoe-horned everyone's in...
Interestingly, when the Jt Explosive Regs were being written, the Army wasn't very engaged and we've ended up with a JSP based very closely on the old Ex Regs APs. The Senior Service, of course, uses it's own rules as soon as it hits the oggin, so doesn't really care...