two ways of taking it!
1 - they could be a good leader of people and organisation etc and if they listen to the more medically knowlegable then they could get a long
2- in the NHS they are classed as band 2/3 workers, they do not have the skills of nurses/doctors/OPD's etc infact they don't have many clinical skills (don't shoot me I was one once and found that you were very limited) and you wouldn't have a staff nurse or a HCA incharge or a ward department, which is essentially I imagine what an officer would do and essentially they are providing medical care.
Personally I don't think as a trained nurse I would want to take orders from a HCA after all the training an knowledge I have learnt. But then again a HCA may still be able to lead etc, but at the end of the day, a nursing/medical officer is there to lead and to provide knowledge and understanding of medical topics/situations etc and if a situation came about where a leader was needed to instruct about a medical situation, inlcluding providing treatment and theory, I don't think that is the job of a HCA! On the basis of admin skills etc it could work to provide support (like a ward clark/manager in the civi world)