Even though he is working within the C-IED TF it's not necessarily all doom and gloom (never did me any harm!).
Besides the teams that deploy onto the ground there are the supporting elements that are safely ensconced in Bastion. Besides working in the armoury, he could be used to help maintain the remote equipments (wheelbarrow, cyclops, chevette) or he could work with the Weapons Intelligence Section (WIS) dealing with recovered insurgent weapons. He could be employed as a driver purely for use within Bastion, after all there are welfare and training and QM elements that require such support.
To deploy onto the ground he would have had to do much more training than just holding an FMT 600.
To actually leave the Santuary of Bastion with a team he would have to be trained in one or more of the following:
Advanced Search
IEDD HT No2
WIS
Husky and/or mastiff vehicles.
ATO's Escort (there is no training for this, but he would be warned and have integrated with a team).
Whatever happens if he feels that he may struggle mentally on the ground as a result of PTSD he must have the moral courage to let people know, otherwise he will be a liability. I suggest he speaks to the padre or a TRIM trained SNCO.
Anything else you need to know about the C-IED TF just PM me.