I struggled to reply and waited a long time before going ahead, as earlier, I did not know how to explain it, without talking about TTPs in a long winded manner. A big 90mm gun does intimidate rebels and can be employed in a direct support role, if desperate. If the fight is urban, you need MBTS (otherwise it is misuse of armour assets) and supporting arms — especially mortars in an urban fight. As MBTS can’t be everywhere — takes up to a week to ship to remote locations — they are a stop gap. More importantly, a 90mm gun is easy to maintain for 365 deployment. As a plus, the rebels can’t steal a 90mm gun. ATGMs can be bought and sold. BTW, ATGMs especially the early generation ones were fragile. 10 to 30% would stop working after 1 year or less. Even modern ATGMs need good storage due to the optics and electronics — if you keep them in the field, you may need to check them throughout the life cycle. Same concept of operations — so no retraining to new doctrine is needed. Armoured recce role, with a 90mm gun. Its more French in origin as a doctrine but still valid — if it suits the TNI context and terrain. The SAF has had to evolve our methods of war due to changes in our threat matrix, terrain and possible IO by enemy. Ideally a battle group should have a good mix of weapons to deliver different effects. The 90mm gun can assist to break through strong points of rebel groups or act as a mobile armoured reserve to respond to counter attacks (i.e. reduce tactical options of rebel groups and reduce the chance of TNI units being over-run after a well planned rebel attack).