As a former US Army Military Intelligence Officer, three tours in Vietnam,
two of which were as a CIA detailee, the third after the troops left (and later a CIA Operations Officer), I can assure you that we all were well armed indeed.
But, in regard to how to refer to CIA field or operational persons, they are most definitely "operations officers". The term "agent" refers to a recruited individual, not a CIA case officer. It never fails to amaze me the ignorance of today's media, most of whom refer to CIA officers as "agents." They also refer to people like Rick Ames, a former CIA officer who was a recruited agent of the Soviet KGB, and Robert Hanssen, a former FBI Special Agent, also a recruited agent of the KGB, as "double agents". A double agent is a recruited agent of two opposing intelligence services, but who owes his loyalty to just one. Thus both Ames and Hanssen were not "double agents" because they were only the recruited agents of one service, not two. This bit of terminology also bewilders most of the media, and book publishers.
Finally, to get back to the arms question, the answer is "depends upon
the situation". In Vietnam my choice was to carry three handguns, a Browning 25 ACP, a S&W Chiefs Special and the best of them all, a Browning T Series Hi-Power. If the occasion called for it, I had a Swedish K Submachine Gun, and one of the first two Uzi's in country, great for concealment, as it would fit into an airlines plastic shoulder bag.
Have a nice day.
RKO