NEMA, Mauritania — With France planning to start withdrawing its troops from Mali next month, Western and African officials are increasingly concerned that the African soldiers who will be relied on to continue the campaign against militants linked to Al Qaeda there do not have the training or equipment for the job.

The heaviest fighting so far, which has driven the militants out of the towns and cities of northeastern Mali, has been borne by French and Chadian forces, more or less alone. Those forces are now mostly conducting patrols in the north, while troops sent by Mali’s other regional allies, including Nigeria and Senegal, have been slow to arrive and have focused on peacekeeping rather than combat, prompting grumbles from Chad’s president, Idriss Déby Itno.

The outcome of the fighting in Mali carries major implications not only for France, but also for the Obama administration, which is worried that Al Qaeda in the Islamic Maghreb and other militant groups could retain a smaller but enduring haven in remote mountain redoubts in the Malian desert.

To help the French, the United States began flying unarmed surveillance drones over the region last month from a new base in Niger. And the administration has spent more than $550 million over the past four years to help train and equip West African armies to fight militants so that the Pentagon would not have to. But critics contend that the United States seems to have little to show for that effort.