How can an NSOperationQueue wait for two async operations?

How can I make an NSOperationQueue (or anything else) wait for two async network calls with callbacks? The flow needs to look like this

Block Begins {
    Network call with call back/block begins {
        first network call is done 
    }
}
Second Block Begins {
    Network call with call back/block begins {
        second network call is done 
    }
} 

Only run this block once the NETWORK CALLS are done {
    blah
}

Here's what I have so far.

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
__block NSString *var;


[queue addOperation:[NSBlockOperation blockOperationWithBlock:^{
   [AsyncReq get:^{
       code
    } onError:^(NSError *error) {
       code
    }];
}]];

[queue addOperation:[NSBlockOperation blockOperationWithBlock:^{
   [AsyncReq get:^{
       code
    } onError:^(NSError *error) {
       code
    }];
}]];
[queue waitUntilAllOperationsAreFinished];
//do something with both of the responses

Do you have to use NSOperation Queue? Here's how you can do it w/ a dispatch group:

dispatch_group_t group = dispatch_group_create();

dispatch_group_enter(group);
[AsyncReq get:^{
    code
    dispatch_group_leave(group); 
} onError:^(NSError *error) {
    code
    dispatch_group_leave(group);
}];


dispatch_group_enter(group);
[AsyncReq get:^{
    code
    dispatch_group_leave(group); 
} onError:^(NSError *error) {
    code
    dispatch_group_leave(group);
}];

dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    NSLog(@"Both operations completed!")
});