KABUL (Reuters) - American air strikes in Afghanistan this year have already significantly surpassed the total number conducted in 2015, a stark indicator of the United States’ struggle to extricate itself from the conflict and stick to its declared “non-combat” mission.

A U.S. Air Force F-16 Flying Falcon fighter bomber takes off for a mission from Bagram air field in Afghanistan August 11, 2016. REUTERS/Josh Smith

American warplanes have conducted around 700 air strikes so far this year, compared to about 500 in total last year, according to U.S. military officials, signaling a deeper role for American forces that is expected to continue for the foreseeable future.

Ending American involvement in Afghanistan was one of President Barack Obama’s signature promises and he declared the combat mission over at the end of 2014.

In the last year of his presidency, however, rising violence has led Obama to keep more U.S. forces in the fight, both to target a growing Islamic State presence and back up struggling Afghan troops.

Top American military commanders in Afghanistan successfully pressed Obama to reverse earlier restrictions on the use of air strikes, clearing the way for a spike in attacks on Islamic State and Taliban targets.

“The increase in strikes is due to the additional authorities U.S. forces received and due to the Afghan change in strategy to offensive operations,” U.S. military spokesman Brigadier General Charles Cleveland told Reuters in a statement.

“The new authorities have allowed the U.S. to be more proactive and deliberate in supporting this year’s Afghan offensive operations and in aggressively targeting (Islamic State).”

With no end in sight for one of America’s longest wars, any decisions on the future of the airstrikes and nearly 9,000 U.S. troops that will remain in Afghanistan will be up to the winner of the Nov 8 American presidential election.

“It will be important to ask if the relaxation of rules of engagement that President Obama provided to American/NATO forces in Afghanistan in 2016 should go further, allowing even more substantial use of their airpower against the Taliban,” wrote a dozen former U.S. military commanders and ambassadors to Afghanistan in an October report outlining challenges for the next president.

Slideshow ( 2 images )

TARGETING ISLAMIC STATE

Of the approximately 700 air strikes that occurred between January 1 and October 20, about 240 were under rules approved by Obama in June that allowed U.S. forces to more actively support Afghan troops during strategic combat operations, Cleveland said.

A similar number were conducted against “counterterrorism” targets, including about 50 against al Qaeda and 190 against Islamic State, he said.

Other air strikes can be conducted in defense of U.S. and international military advisors, as well as some Afghan troops.

American air strikes have been credited with helping to prevent Taliban forces from completely overrunning cities like Lashkar Gah, the capital of embattled Helmand province, but militants still contest or control as much as a third of the country.

“Washington’s military planners originally expected Afghan troops to be able to hold their own more than a decade after the United States’ initial invasion,” the private intelligence firm Stratfor concluded in a recent report. “But with instability still plaguing Afghanistan’s north, south and east, they are as dependent on foreign air power and aid as they were when Operation Enduring Freedom began.”

The nascent Afghan air force has also nearly doubled its air strikes, U.S. officials said, but has yet to fully take over the air war against Taliban and other insurgents.

“(U.S.) air strikes are very important and we need them for a longer time to tackle our enemies,” Afghan Ministry of Defense spokesman Dawlat Waziri said.

In Afghanistan, the U.S. Air Force maintains a single squadron of F-16 fighter bombers, a unit of armed unmanned aircraft, and a handful of special operations AC-130 gunships. The U.S. Army also deploys its own Apache attack helicopters, and have been observed supporting Afghan troops in places like Kunduz.

For the first time since 2006, massive B-52 bombers operating out of Qatar flew at least two missions in Afghanistan over the summer when they were used to bomb Islamic State targets in preparation for a ground assault by Afghan troops in Nangarhar.

Now the air force says it may use any number of the more than 750 aircraft deployed around the region to strike targets in Afghanistan.

“Coalition airpower degrades the enemies capability, denies their sanctuary and eliminates their ability to take or hold territory,” said air force spokeswoman Kiley Dougherty.

While “counterterrorism” strikes and protection for coalition forces remain the “bread and butter” for American fighter pilots, the new operations have “changed dynamic quite a bit” as U.S. missions more closely align to Afghan troop movements, said F-16 pilot Rider, who spoke at on condition of being identified only by his call sign.

Besides the changes in targets that American warplanes are allowed to attack, the U.S. military now has a “more mature” relationship with the Afghans that allows air strikes to be called in more effectively is support of the government troops, Rider said in a recent interview at Bagram airfield.