New Zealand troops loading an L5 howitzer into an M113 armoured personnel carrier in Vietnam.
From Ian McGibbon, New Zealand's Vietnam War (2010) p95:
The L5 howitzer, [US Brigadier General Ellis W.] Williamson noted soon after the New Zealanders arrived 'appears to be an ideal gun for this war'. His enthusiasm derived from the weapon's portability. Weighing only 1300 kilograms, it was light enough to be carried by helicopter and compact enough to fit into the M113 armoured personnel carrier (APC).