Without a clearly stated mission and objectives the project will drift, bog down, or continue past an appropriate endpoint.

没有详细地制订任务和确立目标会造成整个项目偏离目标，停滞不前，或者错过适当的终点。

youdao

These are hardly indicators of an organisation in mission drift.

ECONOMIST: Debating human rights

Some 150 British soldiers defended the mission station Rorke's Drift against 4, 000 Zulus in 1879.

BBC: Rorke's Drift 'forgotten' soldier David Jenkins honoured