Anyone required to attend a course outside of the local area, doesn't narrow it down much. Submarines, ships, aircraft (think aviation engineers travelling abroad with an aircraft). My own example would have been needing to book a flight to the Far East when in Gibraltar when both my works phone and personal phone where not usable.Who are these people who are expected to travel but are IT illiterate? Who works in an environment which doesn’t have actually access to IT?
The point is that we have a working system that has minimal burden to the MOD for its use. Stuff booking a battlefield study, arriving at the airhead to find half of those who are coming are booking onto later flights, different hotels or not booked at all, especially if you have a duty of care. Oh and now I've got to AGAI a load of people on my return when we could have given it all to the travel clerk to do.